Download INVERTER BIG RAC (Preliminary Technical Seminar)

Air-to-Water Heatpump
Product Training
SDC & SDF Series
22nd – 23rd July 2010
Content
Content of Product Training
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Product Line Up
System of Model Number
Product Feature
Product Specification
Product Dimension
Product Operating Condition
Competitors Product Comparison
Location of Controls & Components
Refrigeration Cycle & Water Circuit
System Configuration
Block & Wiring Diagrams
Indoor Unit Installation
Optional External Device Installation
Operation & Control
Servicing Mode
Self-diagnosis Method
Product Line Up
Content
Product Line Up
7kW
9kW
12kW
14kW
16kW
WH-SDC07C3E5
WH-SDF07C3E5
WH-SDC09C3E5
WH-SDF09C3E5
WH-SDC12C6E5
WH-SDF12C6E5
WH-SDC14C6E5
WH-SDF14C6E5
WH-SDC16C6E5
WH-SDF16C6E5
WH-UD07CE5-A
WH-UD09CE5-A
WH-UD12CE5-A
WH-UD14CE5-A
WH-UD16CE5-A
Indoor Unit
Outdoor Unit
System of Model Number
System of Model Number
Heat exchange unit
Indoor Unit
WH
S
WH : Air-to-Water
S : Split-type
D : Standard
F : Heating Only ; C : Heating & Cooling
Heating Capacity (kW)
Generation (Development Sequence)
Backup Heater Size (3: 3kW ; 6: 6kW)
Destination (E: Europe)
Power Source (5: Single Phase ; 8: Three Phase)
D
F
07
C
3
E
5
System of Model Number
Heat exchange unit
Outdoor Unit
WH
U
WH : Air-to-Water
U : Split-type
D : Standard
Heating Capacity (kW)
Generation (Development Sequence)
Destination (E: Europe)
Power Source (5: Single Phase ; 8: Three Phase)
Connectivity (A: SDF or SDC indoor unit)
D
07
C
E
5
A
Product Feature
Content
Product Feature
Top Class Energy Saving & Compact
Heat Exchanger Unit in Industry
892mm
Optimized use of Air-to-Air Heat Pump technology
to realize up to COP 4.67* Panasonic Air-to-Water
* EUROVENT standard (7oC outdoor ambient temperature /
35oC leaving water temperature) for 16.0kW model
Space saving installation with compact design of
heat exchanger unit (total volume 0.158m3)
502mm
353mm
Volume ratio compare with Daikin Altherma
51%, Toshiba Estia 52%, Hitachi AquaFree
53% & Fujitsu General 58%
Content
Product Feature
Flexible Application & Easy
Installation of Heat Pump Unit
Maximum
40m Pipe
Length
Optimize design for installation space. Long pipe
specification improves the flexibility for long piping
installation up to 40m* & height difference up to 30m*
Maximum
30m
Height
Difference
Pipe connection flexibility allow outdoor pipe
connection in four directions (front, bottom, side, rear)
to indoor heat exchanger unit
* for the 12kW, 14kW and 16.0kW models
Rear
Side
Front
Bottom
Content
Product Feature
Easy Maintenance, Monitoring
Operation of Heat Exchanger Unit &
Weekly Timer
Front maintenance design of heat exchanger unit
allow front panel to be opened or closed by just three
screws. Thus, service or maintenance is convenient
Easy monitoring of operation status (OFF/ON, outdoor
& water inlet & outlet temperatures, abnormality) from
the front control panel of heat exchanger unit
It is possible to program operation in accordance with
the typical weekly schedule (6 programs per day and
42 programs per week)
Control Panel
Content
Product Feature
Wide Range (7kW ~ 16kW), Flexibility
& High Connectivity to Existing or
New Installation
The Aquarea offer wide ranges (7kW ~ 16kW) that
adapt just as well to an existing installation as boiler
backup or to a new installation with radiant floor, lowtemperature radiators or even fan-coil (in heating and
cooling for the SDC models). These ranges also
allow connect to a solar kit to increase efficiency and
minimise the impact of ecosystem.
Product Specification
Product Specification
Indoor Unit Specification (SDC)
Specification items
7kW
9kW
12kW
14kW
dB (A)
C/H : 30
Power Level dB
C/H : 43
Height
mm
892
Width
mm
502
Depth
mm
353
16kW
Noise level
Dimension
Net weight
kg
45
51
6.35 (1/4)
9.52 (3/8)
Refrigerant
pipe diameter
Liquid
mm (inch)
Gas
mm (inch)
15.88 (5/8)
Water pipe
diameter
Inlet
mm (inch)
28.00 (1-3/32)
Outlet
mm (inch)
28.00 (1-3/32)
Water drainage diameter
mm (inch)
15.00 (19/32)
Motor type
Water pump
Capacitor Run Induction (2.5uF)
No. of speed
Input power
Capacitor Run Induction (5uF)
3
W
100
190
Water flow rate
l/min
Pressure relief valve
kPa
Open: 190; Close: 183 and below
Protective device (RCCB)
A
40
Expansion vessel volume
l
10
Electrical heater
kW
C: 17.6; H: 20.1
C: 20.4; H: 25.8
3.00
C: 28.7; H: 34.4
C: 33.0; H: 40.1
6.00
C: 35.0; H: 45.9
Product Specification
Indoor Unit Specification (SDF)
Specification items
7kW
9kW
12kW
dB (A)
30
Power Level dB
43
Height
mm
892
Width
mm
502
Depth
mm
353
14kW
16kW
Noise level
Dimension
Net weight
kg
43
49
6.35 (1/4)
9.52 (3/8)
Refrigerant
pipe diameter
Liquid
mm (inch)
Gas
mm (inch)
15.88 (5/8)
Water pipe
diameter
Inlet
mm (inch)
28.00 (1-3/32)
Outlet
mm (inch)
28.00 (1-3/32)
Water drainage diameter
mm (inch)
15.00 (19/32)
Motor type
Water pump
Capacitor Run Induction (2.5uF)
No. of speed
Input power
Capacitor Run Induction (5uF)
3
W
100
190
Water flow rate
l/min
Pressure relief valve
kPa
Open: 190; Close: 183 and below
Protective device (RCCB)
A
40
Expansion vessel volume
l
10
Electrical heater
kW
20.1
25.8
3.00
34.4
40.1
6.00
45.9
Product Specification
Heat exchange unit
Outdoor Unit Specification (SDC)
Specification items
7kW
9kW
12kW
14kW
16kW
*Cooling capacity
kW
6.00
7.00
10.00
11.50
12.20
EER
W/W
2.61
2.41
2.78
2.61
2.54
*Heating capacity
kW
7.00
9.00
12.00
14.00
16.00
*COP
W/W
4.40
4.10
4.67
4.50
4.23
dB (A)
C/H: 48
C: 50; H: 49
C/H: 50
C: 52; H: 51
C: 54; H: 53
Power Level dB
C/H: 66
C: 68; H: 67
C: 68; H: 67
C: 70; H: 68
C: 72; H: 70
Noise level
Dimension
Height
mm
Width
mm
900
Depth
mm
320
Net weight
kg
795
1340
66
Refrigerant control device
106
Expansion valve
Refrigerant oil
cm3
FV50S (900)
FV50S (1200)
Refrigerant (R410A)
kg
1.45
2.75
Liquid
mm (inch)
6.35 (1/4)
9.52mm (3/8)
Gas
mm (inch)
15.88 (5/8)
Standard pipe length
m
7
Pipe length range
m
3 ~ 30
3 ~ 40
Maximum height difference
m
20
30
Refrigerant
pipe diameter
Product Specification
Outdoor Unit Specification (SDC)
Specification items
7kW
9kW
12kW
14kW
Additional gas charging
g/m
30
50
Refrigerant chargeless
m
10
30
Compressor
Type
Hermetic motor
Motor type
Brushless (4-pole)
Rated output
kW
1.70
3.00
Type
Propeller fan
Motor type
Transistor (8-pole)
Output power
16kW
W
60
RPM
C: 600 (top); 640
(bottom)
H: 510 (top); 550
(bottom)
Fan
Speed
C: 670; H: 580
C: 700; H: 640
C: 630 (top); 670
(bottom)
H: 540 (top); 580
(bottom)
C: 630 (top); 670
(bottom)
H: 580 (top); 620
(bottom)
Product Specification
Heat exchange unit
Outdoor Unit Specification (SDF)
Specification items
7kW
9kW
12kW
14kW
16kW
*Heating capacity
kW
7.00
9.00
12.00
14.00
16.00
*COP
W/W
4.40
4.10
4.67
4.50
4.23
dB (A)
48
49
50
51
53
Power Level dB
66
67
67
68
70
Noise level
Dimension
Height
mm
Width
mm
900
Depth
mm
320
Net weight
kg
795
1340
66
Refrigerant control device
106
Expansion valve
Refrigerant oil
cm3
FV50S (900)
FV50S (1200)
Refrigerant (R410A)
kg
1.45
2.75
Liquid
mm (inch)
6.35 (1/4)
9.52mm (3/8)
Gas
mm (inch)
15.88 (5/8)
Standard pipe length
m
7
Pipe length range
m
3 ~ 30
3 ~ 40
Maximum height difference
m
20
30
Refrigerant
pipe diameter
Product Specification
Outdoor Unit Specification (SDF)
Specification items
7kW
9kW
12kW
14kW
Additional gas charging
g/m
30
50
Refrigerant chargeless
m
10
30
Compressor
Type
Hermetic motor
Motor type
Brushless (4-pole)
Rated output
Fan
kW
1.70
3.00
Type
Propeller fan
Motor type
Transistor (8-pole)
Output power
W
Speed
RPM
16kW
60
580
640
510 (top); 550
(bottom)
540 (top); 580
(bottom)
580 (top); 620
(bottom)
Product Dimension
Product Dimension
Heat exchange unit
Indoor Unit Dimension (7kW ~ 16kW)
Unit: mm
Product Dimension
Heat exchange unit
Outdoor Unit Dimension (7kW ~ 9kW)
30cm
Unit: mm
Product Dimension
Heat exchange unit
Outdoor Unit Dimension (12kW ~ 16kW)
30cm
Unit: mm
Product Operating Condition
Product Operating Condition
Heat exchange unit
Product Operating Condition
Cooling
Heating
Indoor
Outdoor
Water outlet temperature (oC)
Ambient temperature (oC)
Maximum
20
43
Minimum
5
16
Maximum
55
35
Minimum
25
-20
When outdoor temperature is out of the above temperature range, the cooling or heating
capacity will drop significantly and outdoor unit might stop for protection control.
Location of Controls &
Components
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
7
6
4
3
25
13
5
11
8
12
9
24
10
23
2
1
* for the SDF control panel, there’s no Cool Mode Indicator
*
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
19
17
22
*
18
14
15
20
21
16
* for the SDF control panel, there’s no Water
set temperature during cool mode (5oC ~ 20oC)
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
19
17
22
*
18
14
15
20
21
16
* for the SDF control panel, there’s no Cool +
Tank and Cool Mode selection
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
Location of Controls & Components
Indoor Unit Control Panel (7kW ~ 16kW)
Location of Controls & Components
Heat exchange unit
Indoor Unit Components
(Activate when water
pressure exceeds 0.20MPa)
(10L)
Refrigeration Cycle &
Water Circuit
Refrigeration Cycle & Water Circuit
Heat exchange unit
System Configuration
System Configuration
Block & Wiring Diagrams
Block & Wiring Diagrams
Indoor Unit & Outdoor Unit Block Diagram (7kW ~ 9kW)
Block & Wiring Diagrams
Indoor Unit & Outdoor Unit Block Diagram (12kW ~16kW)
Block & Wiring Diagrams
Heat exchange unit
Indoor Unit Wiring Diagram (7kW ~ 9kW)
Block & Wiring Diagrams
Heat exchange unit
Indoor Unit Wiring Diagram (12kW ~ 16kW)
Block & Wiring Diagrams
Heat exchange unit
Outdoor Unit Wiring Diagram (7kW ~ 9kW)
Block & Wiring Diagrams
Heat exchange unit
Outdoor Unit Wiring Diagram (12kW ~ 16kW)
Indoor Unit Installation
(7kW ~ 16kW)
Indoor Unit Installation
Heat exchange unit
Indoor Unit Installation Diagram
IMPORTANT: Cover refrigerant circuit’s tube connectors
and pipes properly to prevent water or moisture from
entering the circuit during installation and service work.
Failing to do so may cause the system to malfunction.
Ø28.00mm (1-3/32”)
Ø28.00mm (1-3/32”)
* For SDF models, 2-way valve cable is NOT required
Indoor Unit Installation
Heat exchange unit
How to Fix Installation Plate
Indoor Unit Installation
Heat exchange unit
Install The Indoor Unit
Indoor Unit Installation
Heat exchange unit
Water Pipe Installation
1. The minimum requirement of water in the
system is 30 litres (for 7kW ~ 9kW models) and 50
litres (for 12kW ~ 16kW models). If this value
could not be achieved, please install additional
buffer tank (field supply).
2. Cover the pipe end to prevent dirt and dust
when inserting it through wall.
3. Must install an external filter (30 mesh or more,
field supply) before water inlet connector of indoor
unit (indicated with “WATER IN”).
4. Use Rp 1-1/4” nut for both water inlet and water
outlet connection and clean all piping with tap
water before install.
5. Be sure to use two spanners to tighten the
connection with 117.6N.m torque. Over tightening
will cause water leakage.
6. Make sure to insulate the water circuit pipes to
prevent reduction of heating and cooling capacity.
7. Mount the PS foam and long banding strap
(factory supply as accessory for SDC models) to
water inlet and water outlet connectors.
* Only applicable for SDC models.
Indoor Unit Installation
Heat exchange unit
Drain Hose Installation
Indoor Unit Installation
Heat exchange unit
Drain Elbow & Hose Installation (for SDC models only)
Indoor Unit Installation
Heat exchange unit
Electrical Cable Connection (7kW ~ 9kW)
(4 x 4.0 or 6.0mm2)
(3 x 4.0mm2)
(3 x 4.0 or 6.0mm2)
Power Supply 1 - For indoor and outdoor units.
Power Supply 2 - For indoor unit backup heater (3kW)
and tank unit booster heater (3kW)
Terminal board for external
device connection
Indoor Unit Installation
Heat exchange unit
Electrical Cable Connection (12kW ~ 16kW)
(4 x 4.0 or 6.0mm2)
(3 x 4.0mm2)(3 x 1.5mm2)
(3 x 4.0 or 6.0mm2)
Power Supply 1 - For indoor and outdoor units.
Power Supply 2 - For indoor unit backup heater (6kW)
Power Supply 3 - For tank unit booster heater (3kW)
Terminal board for external
device connection
Indoor Unit Installation
Heat exchange unit
Electrical Cable for Optional External Device (Field Supply)
* for the SDC models
Indoor Unit Installation
Heat exchange unit
Optional External Device Connecting Requirement
Install a solar connection PCB (CZNS1P) when solar station is utilized.
1-pole (min 3.0mm
contact gap)
* for the SDC models
Must connect a jumper between
terminal no.13 & no.14, when there’s
no tank OLP connection.
Maximum output power of tank
booster heater should be ≤ 3kW.
Optional External Device
Installation
Optional External Device Installation
(a) External Room Thermostat
Recommended external room thermostat:
To connect an external
room thermostat, make
sure set the external
thermo controller
connection to YES
through Special
Functions Setting
REMOTE indication will display
when external thermo controller
connection is set to YES
REV200
Optional External Device Installation
(a) External Room Thermostat
Optional External Device Installation
(b) 3- Way Valve Control
Recommended 3- way valve kit:
3-way valve function:
To change the flow direction of hot/cold water to room side or hot water to tank side.
(AB -> A: CLOSE)
SFA21/18
(AB -> B: OPEN)
(Tank Side)
1. During STOP/HEAT/COOL/FORCE HEATER/PUMPDOWN MODE, relay
is default at terminal no.04. (AB -> B: OPEN)
2. During TANK MODE, relay is switched to terminal no.05. (AB -> A: OPEN)
VXI46/25
(Room Side)
Optional External Device Installation
(c) 2- Way Valve Control (for SDC models only)
Recommended 2- way valve kit:
2-way valve function:
To allow hot water to radiant floor and/or radiator or to block cold water to radiant floor and/or radiator.
SFA21/18
(A -> AB: CLOSE)
(radiant floor/radiator)
1. During STOP/TANK/COOL/PUMPDOWN MODE, relay is default at
terminal no.01. (A -> AB: CLOSE)
2. During HEAT/FORCE HEATER MODE, relay is switched to terminal
no.02. (A -> AB: OPEN)
VVI46/25
Optional External Device Installation
(c) Solar Connection PCB (CZ-NS1P) & Control
Connecting cable length
must NOT exceed 10m !
1. When solar station pump P2 OFF, CZ-NS1P
relay is default at terminal no.20. AB -> A (CLOSE)
and tank unit is not heat-up by solar station.
2. When solar station pump P2 ON, CZ-NS1P
relay will switch to terminal no.21. AB -> A (OPEN)
and tank unit is heat-up by solar station.
Operation & Control
Operation & Control
(a) Cool Mode Operation (only for the SDC models)
OFF
OFF
Backup & Booster Heaters
1. Thermostat OFF: water outlet temp. < water set temp. - 1.5oC (continuously for 3 mins).
2. Thermostat ON: water outlet temp. > water inlet temp. (at the time of thermostat OFF is triggered) + 3oC (3 mins delay restart).
3. Solar OFF: tank temp. > 77oC; Solar ON: tank temp. < 70oC.
4. Indoor water pump always ON.
Operation & Control
Heat exchange unit
(b) Cool + Tank Mode Operation (only for the SDC models)
OFF
OFF
1. Thermostat OFF: water outlet temp. < water set temp. - 1.5oC (continuously for 3 mins).
2. Thermostat ON: water outlet temp. > water inlet temp. (at the time of thermostat OFF is triggered) + 3oC (3 mins delay restart).
3. Solar OFF: tank temp. > 77oC; Solar ON: tank temp. < 70oC.
4. Indoor water pump always ON.
Operation & Control
(c) Heat Mode Operation
OFF
ON
Booster Heater
1. Thermostat OFF: water outlet temp. > water set temp. + 2.0oC (continuously for 3 mins).
2. Thermostat ON: water outlet temp. < water inlet temp. (at the time of thermostat OFF is triggered) - 3oC (3 mins delay restart).
3. Backup heater OFF: water outlet temp. > water set temp. - 2oC (continuously for 15 secs).
4. Backup heater ON: water outlet temp. < water set temp. - 8oC AND after 20 mins since previous OFF.
Operation & Control
(d) Tank Mode Operation
ON
OFF
1. Water set temp. = tank set temp. or 55oC whichever is lower.
2. Thermostat OFF: tank temp. > water set temp. + 2oC (continuously for 3 mins).
3. Thermostat ON: tank temp. < water set temp. - 3oC AND water pump ON for 3 mins.
4. Water pump ON: tank temp. < tank temp. (at the time thermostat OFF is triggered) - 3oC.
5. When solar priority is set, heatpump and booster heater OFF when solar request ON.
6. 2 way valve always OFF.
Operation & Control
(d) Tank Mode Operation
ON
OFF
If solar priority is not set, solar 3WV ON
only after heatpump thermostat OFF.
1. Water set temp. = tank set temp. or 55oC whichever is lower.
2. Thermostat OFF: tank temp. > water set temp. + 2oC (continuously for 3 mins).
3. Thermostat ON: tank temp. < water set temp. - 3oC AND water pump ON for 3 mins.
4. Water pump ON: tank temp. < tank temp. (at the time thermostat OFF is triggered) - 3oC.
5. 2 way valve always OFF.
Operation & Control
(e) Heat + Tank Mode Operation (Heating No Priority)
OFF/ON
ON
1. During heating heat-up interval, switch to tank heat-up when heating
heat-up interval ends, and tank temp. < tank set temp. - 3oC (AND solar
3WV OFF if solar priority is set) is fulfilled
2. During tank heat-up interval, switch to heating heat-up when tank heat-up
interval ends OR tank temp. > tank set temp. + 2oC (continuously 3 mins)
3. During heating heat-up interval, backup & booster heaters ON/OFF
follows normal operation control
4. Once switch to tank heat-up interval, backup & booster heaters OFF and
booster heater delay timer start counting. Booster heater ON after delay
timer AND tank temp. < tank set temp.
Operation & Control
(e) Heat + Tank Mode Operation (Heating No Priority)
OFF/ON
ON
1. During heating heat-up interval, switch to tank heat-up when heating
heat-up interval ends, and tank temp. < tank set temp. - 3oC (AND solar
3WV OFF if solar priority is set) is fulfilled
2. During tank heat-up interval, switch to heating heat-up when tank heat-up
interval ends OR tank temp. > tank set temp. + 2oC (continuously 3 mins)
3. During heating heat-up interval, backup & booster heaters ON/OFF
follows normal operation control
4. Once switch to tank heat-up interval, backup & booster heaters OFF and
booster heater delay timer start counting. Booster heater ON after delay
timer AND tank temp. < tank set temp.
If solar priority is not set, solar 3WV ON
only after switch to heating heat-up interval.
Operation & Control
Setting Water Outlet Temperature (Heat Mode)
Operation & Control
Water Temperature Thermo Shift Setting
Operation & Control
Indoor Unit Backup Heater Control
1. Normal Heat Mode
2. Force Heat Mode
(i) Backup heater ON condition:
(i) Backup heater ON condition:
- HEATER button is pressed ON
- FORCE button is pressed ON
- After heatpump ON for 30 mins
- After water pump ON for 9 mins
- After water pump ON for 9 mins
- When water outlet temp. < water set temp. - 8oC
- When outdoor ambient temp. < outdoor set temp. for backup heater
- 20 mins since previous backup heater OFF
- When water outlet temp. < water set temp. - 8oC
- 20 mins since previous backup heater OFF
(ii) Backup heater OFF condition:
- FORCE button is pressed OFF
(ii) Backup heater OFF condition:
- When outdoor ambient temp. > outdoor set temp. + 2oC
(continuously for 15 secs)
- When water outlet temp. > water set temp. - 2oC (continuously
for 15 secs)
- When water outlet temp. > water set temp. + 2oC (continuously for
15 secs)
- When switch to tank heat-up interval
- Water pump OFF
- HEATER button is pressed OFF
- Heatpump thermostat OFF
- Heatpump OFF
When heatpump stops due to error protection
(except water outlet temp. sensor error, water
inlet temp. sensor error, or flow switch error),
backup heater will force ON automatically
(even HEATER/FORCE is not selected).
Operation & Control
Tank Unit Booster Heater Control
(i) Tank booster heater ON condition:
- When tank temp. < tank set temp. - 5oC
- 20 mins since previous booster heater OFF
- After booster heater delay timer ON during heatpump startup in
TANK MODE OR switching from heating heat-up interval to tank
heat-up interval in HEAT + TANK MODE
BOOSTER HEATER OFF
Tank set temp. +
2oC
Tank set temp. - 5oC
BOOSTER HEATER ON
(ii) Tank booster heater OFF condition:
- When tank temp. > tank set temp. + 2oC (continuously for 15 secs)
- When switch from heating heat-up interval to tank heat-up interval
Operation & Control
Sterilization Mode
1. Sterilization mode can be set from Special Functions
setting through indoor unit control panel.
2. During sterilization mode, tank unit will be heat-up to
the sterilization set temp. for a certain period of time.
3. Sterilization mode can only be set on TIMER to
operate once in a week.
4. During heatpump OFF (standby), and in HEAT/COOL
mode, sterilization mode will not start.
5. However, sterilization mode will be cancelled when
sterilization set temp. is not achieved after 4 hours.
Operation & Control
Solar Operation Control
SOLAR indication will display when solar
priority is set to YES during Special Functions
setting from indoor unit control panel
Servicing Mode
Servicing Mode
Servicing Mode
Servicing Mode
Self-diagnosis Method
Self-diagnosis Method
Heat exchange unit
When abnormality occur during operation, the system will stop operation,
and OFF/ON LED will blink and error code will display on control panel
system error display LCD. Error code is stored in indoor EEPROM.
System
Error
Display
- To reset control panel error code memory
STEP: Press and hold ERROR RESET button (< 8 seconds) till a beep sound is heard
CHECK
Button
SEARCH
UP/DOWN
Button
- To read past error code stored in indoor EEPROM
STEP 1: Press CHECK button (> 5 seconds) to enter status mode
STEP 2: Press SEARCH UP/DOWN button to retrieve past/last error code
STEP 3: Press CANCEL button or wait 30 seconds to exit status mode
CANCEL
Button
ERROR
RESET
Button
- To permanently erase error code stored in indoor EEPROM
STEP: Press and hold ERROR RESET button (> 8 seconds) till a beep sound is heard
Self-diagnosis Method
Diagnosis Table (Indoor Unit Judgment)
Diagnosis Display
Abnormality/Protection Control
Abnormality Judgment
H90
Indoor / outdoor abnormal communication
60 seconds after operation
F45
Indoor water outlet temperature sensor abnormality
Continue for 5 seconds
H23
Indoor refrigerant liquid temperature sensor abnormality
Continue for 5 seconds
H62
Water flow switch abnormality
Continue for 10 seconds
H76
Indoor - control panel communication abnormality
-
F37
Indoor water inlet temperature sensor abnormality
Continue for 5 seconds
H12
Indoor / outdoor capacity unmatched
90 seconds after power supply
H72
Tank temperature sensor abnormality
Continue for 5 seconds
H70
Indoor backup heater OLP abnormality
Continue for 60 seconds
H91
Tank booster heater OLP abnormality
Continue for 60 seconds
H99
Indoor heat exchanger freeze prevention
-
Self-diagnosis Method
Diagnosis Table (Outdoor Unit Judgment)
Diagnosis Display
Abnormality/Protection Control
Abnormality Judgment
H90
Indoor / outdoor abnormal communication
60 seconds after operation
H15
Outdoor compressor temperature sensor abnormality
Continue for 5 seconds
F46
Outdoor current transformer open circuit
-
F36
Outdoor air temperature sensor abnormality
Continue for 5 seconds
F42
Outdoor heat exchanger temperature sensor abnormality
Continue for 5 seconds
F40
Outdoor discharge pipe temperature sensor abnormality
Continue for 5 seconds
H95
Indoor / outdoor wrong connection
-
H64
Refrigerant high pressure abnormality
Continue for 5 seconds
H42
Compressor low pressure abnormality
-
F27
Pressure switch abnormality
Continue for 60 seconds
H98
Outdoor high pressure overload protection
-
F15
Outdoor fan motor lock abnormality
2 times within 30 minutes
F25
Cooling / heating cycle changeover abnormality
4 times within 30 minutes
F41
PFC control
4 times within 10 minutes
F24
Refrigerant cycle abnormality
2 times within 20 minutes
Self-diagnosis Method
Diagnosis Table (Outdoor Unit Judgment)
Diagnosis Display
Abnormality/Protection Control
Abnormality Judgment
F14
Outdoor compressor abnormal rotation
4 times in 20 minutes
F22
IPM overheating protection
3 times in 30 minutes
F20
Outdoor compressor overheating protection
4 times within 30 minutes
F16
Total running current protection
3 times within 20 minutes
F23
Outdoor DC peak detection
7 times continuously
F12
Pressure switch activate
4 times within 20 minutes
F43
Outdoor defrost temperature sensor abnormality
Continue for 5 seconds
F95
Cooling high pressure overload protection
-
Self-diagnosis Method
Connection Capability Rank Abnormality (H12)
Malfunction Decision Conditions:
During startup operation of cooling and heating, the capability rank of indoor checked by the outdoor is used to
determine connection capability rank abnormality.
Malfunction Caused:
1. Wrong model interconnected.
2. Wrong indoor unit or outdoor unit PCB (main) used.
3. Faulty indoor unit or outdoor unit PCB (main).
Abnormality Judgment:
Continue for 90 seconds.
Self-diagnosis Method
Connection Capability Rank Abnormality (H12)
Troubleshooting:
Check indoor and outdoor
units model number.
Is the indoor and outdoor
model number matched?
No
Match the compatible
model.
Yes
Check the spare part numbers of
the indoor and outdoor unit PCBs
and compare with their Part Lists.
No
Matched compatibility?
Yes
Change for specified indoor
or outdoor unit PCB (main).
Replace the indoor and
outdoor unit PCBs (main).
Self-diagnosis Method
Compressor Tank Temperature Sensor Abnormality (H15)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the compressor tank
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Compressor Tank Temperature Sensor Abnormality (H15)
Troubleshooting:
Check the CN-TANK connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TANK connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the compressor tank temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the compressor tank
temperature sensor
Is the measured resistance of the
compressor tank temperature sensor
matches the value specified in its
characteristic chart?
No
- Defect in compressor tank
temperature sensor
- Replace the compressor tank
temperature sensor
Yes
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Self-diagnosis Method
Indoor Refrigerant Liquid Temperature Sensor Abnormality (H23)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor refrigerant liquid
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Indoor Refrigerant Liquid Temperature Sensor Abnormality (H23)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the indoor refrigerant liquid temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor refrigerant liquid
temperature sensor
Is the measured resistance of the
indoor refrigerant liquid temperature
sensor matches the value specified
in its characteristic chart?
No
- Defect in indoor refrigerant liquid
temperature sensor
- Replace the indoor refrigerant
liquid temperature sensor
Yes
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Self-diagnosis Method
Compressor Low Pressure Protection (H42)
Malfunction Decision Conditions:
During operation of heating and after 5 minutes compressor ON, when outdoor pipe temperature below -29oC
or above 26oC is detected by the outdoor pipe temperature sensor.
Malfunction Caused:
1. Dust accumulation on the outdoor unit heat exchanger.
2. Air short circuit at outdoor unit.
3. 2 way valve partially closed.
4. Faulty outdoor unit fan motor.
5. Refrigerant shortage (refrigerant leakage).
6. Clogged expansion valve or strainer.
7. Faulty outdoor pipe temperature sensor.
8. Faulty outdoor unit PCB (main).
Self-diagnosis Method
Compressor Low Pressure Protection (H42)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the outdoor unit fan
motor operation.
Is the outdoor unit fan
motor operate normally?
Check the dust accumulation on the
outdoor unit heat exchanger.
Is the outdoor unit heat
exchanger dirty?
No
Check for gas leakage.
Yes
Clean the heat exchanger.
Is the oil oozing out from
the 2/3 way valve?
No
Yes
Is there any short circuit?
Provide sufficient air
passage.
No
Yes
Open the 2 way valve.
Yes
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
No
Check the 2-way valve.
No
Replace the outdoor unit
fan motor and/or outdoor
unit PCB (main).
Yes
Check the outdoor air
passage.
Is the 2 way valve partially
closed?
No
Yes
- Replace the expansion
valve and/or strainer
- Reclaim and recharge
refrigerant
Reclaim and recharge for a
specified amount of fresh refrigerant.
Is abnormality happened
again?
No
Yes
- Replace the outdoor unit
PCB (main)
- Replace the outdoor pipe
temperature sensor
- Replace the compressor
Procedure complete
Self-diagnosis Method
Water Flow Switch Abnormality (H62)
Malfunction Decision Conditions:
During operation of cooling and heating, the water flow detected by the indoor water flow switch is used to
determine water flow error.
Malfunction Caused:
1. Faulty water pump.
2. Water leak in system.
3. Faulty connector connection.
4. Faulty water flow switch.
5. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 10 seconds (but no judgment for 9 minutes after compressor startup/restart).
Self-diagnosis Method
Water Flow Switch Abnormality (H62)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Is the CN-FLOW connector
connection normal?
Check the system water pump.
No
- Connector poor contact
- Correct the connection
Yes
No
Replace the faulty water
pump.
Yes
Fix the system water
leakage.
Is the water pump working?
Yes
Check the system water passage.
Is there any water leakage?
No
Check the CN-FLOW connector connection:
- Turn OFF the power
- Check the connector connection
Check the indoor water flow switch:
- Plug out connector from the indoor
unit PCB (main)
- Dismantle the water flow switch
- Position the water flow switch in
reverse direction (downward)
- Measure the continuity of the water
flow switch
No
Is there any continuity?
Yes
- Defect in indoor water flow
switch
- Replace the indoor water
flow switch
- Defect in indoor unit PCB
(main)
- Replace the indoor unit PCB
(main)
Self-diagnosis Method
Outdoor High Pressure Abnormality (H64)
Malfunction Decision Conditions:
During operation of cooling and heating, when the outdoor high pressure sensor output signal is 0Vdc or 5Vdc.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 20 minutes.
Self-diagnosis Method
Outdoor High Pressure Abnormality (H64)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the CN-HPS connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-HPS connector
connection normal?
No
- Connector poor contact
- Correct the connection
Reconnect the high pressure sensor
connector to the outdoor unit PCB
(main). Turn ON the power and run the
system. Measure the DC voltage pin 1
& 3 (GND) of CN-HPS.
Yes
Check the continuity of the outdoor unit PCB (main)
high pressure sensor connector CN-HPS:
- Plug out connector from the outdoor unit PCB (main)
- Measure the continuity pin 1 & 3 (GND) and pin 1 &
4 (5V) of CN-HPS
Yes
Is there any continuity?
No
- Defect in outdoor unit
PCB (main)
- Replace the outdoor
unit PCB (main)
Is the measured voltage
0Vdc or 5Vdc?
Yes
No
- Defect in outdoor unit
PCB (main)
- Replace the outdoor
unit PCB (main)
- Defect in outdoor high
pressure sensor
- Replace the outdoor
high pressure sensor
Self-diagnosis Method
Indoor Backup Heater OLP Abnormality (H70)
Malfunction Decision Conditions:
During operation of indoor backup heater, when no power supplies to indoor backup heater or OLP open circuit.
Malfunction Caused:
1. Faulty power supply connector connection.
2. Faulty connector connection.
3. Faulty indoor backup heater overload protector (OLP).
4. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 60 seconds.
Self-diagnosis Method
Indoor Backup Heater OLP Abnormality (H70)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
No
Is the abnormality happened during
operation of indoor backup heater?
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
Check the indoor backup heater incoming
AC power supply (2):
- Turn ON power supply (2) & RCCB
- Measure the AC voltage between RCCB’s
L1 & N1
- Measure the AC voltage between PCB’s
AC2-L3 & AC2-N2
No
Is measured voltage 230Vac?
Yes
Check the CN-OLP1 connector connection:
- Turn OFF the power
- Check the connector connection
Check indoor backup heater OLP
continuity:
- Turn OFF power supply
- Reset heater 1 OLP
- Measure the continuity of OLP
- Defect in RCCB
- Replace RCCB
- Terminal board assembly
connector poor contact
- Correct the connection or
replace the indoor unit PCB
(main)
Is there any continuity?
No
Yes
Is the CN-OLP1 connector
connection normal?
Yes
No
- Connector poor contact
- Correct the connection
Use a test pen to push
this button to reset OLP
Multimeter to
measure continuity
- Defect in indoor backup
heater OLP
- Replace indoor backup
heater OLP
- Defect in indoor unit
PCB (main)
- Replace the indoor unit
PCB (main)
Self-diagnosis Method
Tank Temperature Sensor Abnormality (H72)
Malfunction Decision Conditions:
When tank connection is set to ON, the temperatures detected by the tank temperature sensor are used to
determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Tank Temperature Sensor Abnormality (H72)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Is the abnormality happened during
tank connection set to ON?
No
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
Check the terminal board assembly no. 15 and
no. 16, and CN-TH2 connector connections:
- Turn OFF the power
- Check the connector connections
Is the terminal board assembly
no.15 and no. 16, and CN-TH2
connector connections normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the tank temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the tank temperature
sensor
Is the measured resistance of the
tank temperature sensor matches the
value specified in its characteristic
chart?
No
- Defect in tank temperature sensor
- Replace the tank temperature
sensor
Yes
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Self-diagnosis Method
Indoor-Control Panel Communication Abnormality (H76)
Malfunction Decision Conditions:
During standby and operation of cooling and heating, indoor-control panel error occur.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty control panel.
3. Faulty indoor unit PCB (main).
Self-diagnosis Method
Indoor-Control Panel Communication Abnormality (H76)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the CN-REMOTE connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-REMOTE
connector connection normal?
No
- Connector poor contact
- Correct the connection
Check the DC voltage from the indoor unit PCB (main):
- Plug out connector from the indoor unit PCB (main)
- Turn ON the power
- Measure the DC voltage pin1 & 4 of CN-REMOTE
Yes
Is the remote controller
(control panel) voltage 5Vdc
(pin1 & 4) generated?
Check the control panel cable
connection.
Is the control panel cable
connection normal?
Yes
No
No
- Defect in cable connection
- Replace control panel cable
Yes
- Defect in remote controller
(control panel)
- Replace the remote
controller (control panel)
- Defect in indoor unit PCB
(main)
- Replace the indoor unit PCB
(main)
Self-diagnosis Method
Indoor/Outdoor Abnormal Communication (H90)
Malfunction Decision Conditions:
During operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is
checked whether it is normal.
Malfunction Caused:
1. Faulty outdoor unit PCB (main).
2. Faulty indoor unit PCB (main).
3. Indoor-outdoor signal transmission error due to wrong wiring.
4. Indoor-outdoor signal transmission error due to breaking of wire in the connection wires between the indoor
and outdoor units.
5. Indoor-outdoor signal transmission error due to disturbed power supply waveform.
Abnormality Judgment:
Continue for 1 minute after operation.
Self-diagnosis Method
Indoor/Outdoor Abnormal Communication (H90)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the indoor-outdoor
units connection wires.
Yes
Is there any wiring error?
Correct the indoor-outdoor
units connection wires.
No
Turn OFF the power and disconnect
terminal 3 wire. Turn ON the power
and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate
between 45-60Vdc?
No
Replace the outdoor unit
PCB (main).
Yes
Turn OFF the power and reconnect
terminal 3 wire. Turn ON the power
and again measure Vdc between
terminal 2 & 3 from the outdoor unit.
Is the Vdc fluctuate
between 15-60Vdc?
No
Replace the indoor unit
PCB (main).
Self-diagnosis Method
Tank Booster Heater OLP Abnormality (H91)
Malfunction Decision Conditions:
During operation of tank booster heater, and tank booster heater OLP open circuit.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty tank booster heater overload protector (OLP).
3. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 60 seconds.
Self-diagnosis Method
Tank Booster Heater OLP Abnormality (H91)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
No
Is the abnormality happened during
operation of tank booster heater?
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
Check the CN-OLP2 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-OLP1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Use a test pen to push
this button to reset OLP
Check tank booster heater OLP continuity:
- Turn OFF power supply
- Reset tank booster heater OLP
- Measure the continuity of OLP
Multimeter to
measure continuity
Is there any continuity?
No
- Defect in tank booster heater OLP
- Replace tank booster heater OLP
Yes
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Self-diagnosis Method
Unspecified Voltage between Indoor and Outdoor (H95)
Malfunction Decision Conditions:
The supply power is detected for its requirement by the indoor/outdoor transmission.
Malfunction Caused:
1. Insufficient power supply.
2. Faulty outdoor unit PCB (noise filter/main).
Self-diagnosis Method
Unspecified Voltage between Indoor and Outdoor (H95)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the supply voltage
Supply voltage as specified?
No
Correct the power
supply.
Yes
Check the AC voltage from outdoor unit PCB (noise filter):
- Turn OFF the power
- Plug out connector AC-BLK, CN-BLK & CN-WHT from
the outdoor unit PCB (noise filter)
- Turn ON the power
- Measure the AC voltage between AC-BLK & CN-WHT
Is the measured AC voltage
230V?
No
Yes
Check the rectification voltage
between DCP & DCN.
Is the measured voltage
between DCP & DCN ~325Vdc?
No
Yes
Is the measured AC voltage
230V?
Yes
No
- Defect in outdoor
unit PCB (noise filter)
- Replace the outdoor
unit PCB (noise filter)
Check the AC voltage supply to outdoor unit PCB (main):
- Turn OFF the power
- Reconnect connector AC-BLK, CN-BLK & CN-WHT to
the outdoor unit PCB (noise filter)
- Turn ON the power
- Measure the AC voltage between AC-BLK & CN-WHT
- Defect in outdoor unit PCB
(main)
- Replace the outdoor unit
PCB (main)
- Defect in outdoor unit
PCB (main)
- Replace the outdoor unit
PCB (main)
Check the DC filter (capacitor)
PCB connector connection.
Is the DC filter (capacitor) PCB
connector connection normal?
Yes
No
- Connector poor contact
- Correct the connection
- Defect in outdoor unit PCB
(main)
- Replace the outdoor unit
PCB (main)
Self-diagnosis Method
Outdoor High Pressure Protection (H98)
Malfunction Decision Conditions:
During operation of heating, when pressure 4.0MPa and above is detected by outdoor high pressure sensor.
Malfunction Caused:
1. Faulty water pump.
2. Insufficient water flow rate in system.
3. Water leak in system.
4. 2/3 way closed.
5. Clogged expansion valve or strainer.
6. Excessive refrigerant.
7. Faulty outdoor high pressure sensor.
8. Faulty outdoor unit PCB (main).
Self-diagnosis Method
Outdoor High Pressure Protection (H98)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the 2/3 way valve.
Check the system water pump.
No
Is the water pump working?
Yes
Replace the faulty water
pump.
Check for clogged
expansion valve or strainer.
Check the system water
flow rate.
No
Readjust the water pump
speed.
Is the expansion valve or
strainer clogged (ice formed)?
No
Check the system water passage.
Yes
No
Yes
- Replace the expansion
valve and/or strainer
- Reclaim and recharge
refrigerant
Check refrigerant amount.
Yes
Is there any water leakage?
Open the 2/3 way valve.
No
Yes
Is the water pump speed
adjusted according to system
hydraulic external static pressure?
Is the 2/3 way valve closed?
Is the additional refrigerant
amount filled correctly?
Fix the system water
leakage.
Yes
No
Reclaim and recharge with
correct amount of
refrigerant.
- Replace the outdoor unit
PCB (main)
- Replace the outdoor high
pressure sensor
Self-diagnosis Method
Indoor Freeze-up Protection (H99)
Malfunction Decision Conditions:
During anti-freezing control in cooling operation, when the indoor refrigerant liquid temperature < 0 oC.
Malfunction Caused:
1. Faulty water pump.
2. Insufficient water flow rate in system.
3. Water leak in system.
4. 2 way valve partially closed.
5. Clogged expansion valve or strainer.
6. Refrigerant shortage (refrigerant leakage).
7. Faulty indoor refrigerant liquid temperature sensor.
8. Faulty indoor unit PCB (main).
Self-diagnosis Method
Indoor Freeze-up Protection (H99)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the system water pump.
Is the water pump working?
No
Replace the faulty water
pump.
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
Yes
Check the system water
flow rate.
Yes
No
- Replace the expansion
valve and/or strainer
- Reclaim and recharge
refrigerant
Check refrigerant amount.
Is the water pump speed
adjusted according to system
hydraulic external static pressure?
No
Readjust the water pump
speed.
Yes
Is the additional refrigerant
amount filled correctly?
No
Reclaim and recharge with
correct amount of refrigerant.
Yes
Check the system water passage.
Check the indoor refrigerant
liquid temperature sensor.
Yes
Is there any water leakage?
Fix the system water
leakage.
No
Yes
Check the 2 way valve.
Is the 2 way valve partially
closed?
No
Does it conform to the
sensor characteristic chart?
Replace the indoor unit PCB
(main).
No
Yes
Open the 2 way valve.
Replace the indoor refrigerant
liquid temperature sensor.
Self-diagnosis Method
Outdoor High Pressure Switch Activate (F12)
Malfunction Decision Conditions:
During operation of cooling and heating, when pressure 4.5MPa and above is detected by outdoor high
pressure switch.
Malfunction Caused:
1. Dust accumulation on the outdoor unit heat exchanger.
2. Air short circuit at outdoor unit.
3. Faulty water pump.
4. Insufficient water flow rate in system.
5. Water leak in system.
6. 2/3 way valve closed.
7. Clogged expansion valve or strainer.
8. Excessive refrigerant.
9. Faulty outdoor high pressure sensor and switch.
10. Faulty outdoor unit PCB.
Abnormality Judgment:
Continue 4 times in 20 minutes.
Self-diagnosis Method
Outdoor High Pressure Switch Activate (F12)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the dust accumulation on the
outdoor unit heat exchanger.
Is the outdoor unit heat
exchanger dirty?
No
Check the 2/3 way valve.
Yes
Clean the heat exchanger.
Open the 2/3 way valve.
No
Check the outdoor air
passage.
Check the system water passage.
Yes
Is there any short circuit?
Provide sufficient air
passage.
No
Yes
Is there any water leakage?
No
Check for clogged
expansion valve or strainer.
Check the system water pump.
No
Is the water pump working?
Yes
Check the system water
flow rate.
Is the water pump speed
No
adjusted according to system
hydraulic external static pressure?
Yes
Yes
Is the 2/3 way valve closed?
- Replace the faulty water
pump
- Replace outdoor high
pressure sensor
Yes
Is the expansion valve or
strainer clogged (ice formed)?
No
Check refrigerant amount.
- Readjust the water pump
speed
- Replace outdoor high
pressure sensor
Is the additional refrigerant
amount filled correctly?
Yes
No
- Fix the system water leakage
- Replace outdoor high
pressure sensor
- Replace the expansion valve
and/or strainer
- Reclaim and recharge
refrigerant
- Replace outdoor high
pressure sensor
- Reclaim and recharge with
correct amount of refrigerant
- Replace outdoor high
pressure sensor
- Replace the outdoor unit
PCB (main)
- Replace the outdoor high
pressure sensor and switch
Self-diagnosis Method
Compressor Rotation Failure (F14)
Malfunction Decision Conditions:
A compressor rotation failure is detected by checking the compressor running condition through the position
detection circuit.
Malfunction Caused:
1. Compressor terminal disconnect.
2. Faulty outdoor unit PCB (main).
3. Faulty compressor.
Abnormality Judgment:
Continue 4 times in 20 minutes.
Self-diagnosis Method
Compressor Rotation Failure (F14)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the U, V, and W connector connection:
- Turn OFF the power
- Check the U, V, and W connector connection at
outdoor unit PCB (main) and compressor terminal
Is the connector connection
normal?
No
- Connector poor contact
- Correct the connection
Yes
Outdoor unit
PCB (main)
Compressor
terminal
Disconnect the harnesses U, V, and
W from the compressor terminal.
From the disconnected harnesses U, Y, and
W, connect them to the inverter checker. Turn
ON the power and operate the system. Check
the inverter checker 6 LEDs blinking condition.
Is the blinking of the 6 LEDs in
same sequence/condition?
No
- IPM defective
- Replace the outdoor unit PCB
(main)
Yes
Replace the compressor.
Inverter
checker
Self-diagnosis Method
Outdoor Fan Motor (DC Motor) Mechanism Locked (F15)
Malfunction Decision Conditions:
The rotation speed detected by the Hall IC of the fan motor during fan motor operation is used to determine
abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm).
Malfunction Caused:
1. Operation stop due to short circuit inside the fan motor winding.
2. Operation stop due to breaking of wire inside the fan motor.
3. Operation stop due to breaking of fan motor lead wires.
4. Operation stop due to fan motor Hall IC malfunction.
5. Operation error due to faulty outdoor unit PCB.
Abnormality Judgment:
Continue 2 times in 30 minutes.
Self-diagnosis Method
Outdoor Fan Motor (DC Motor) Mechanism Locked (F15)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Turn OFF the power and
rotate the fan by hand.
Does the fan rotate
smoothly?
No
Replace the fan motor.
Yes
Check the output of the fan motor
from outdoor unit PCB (main).
Turn ON the power and
operate the fan motor.
No
Does it rotate?
Yes
Is the fan motor control voltage
15Vdc (pin5 & 4) generated?
No
Replace the outdoor unit
PCB (main).
No
Replace the outdoor unit
PCB (main).
No
Replace the outdoor unit
PCB (main).
Yes
Check the rotation feedback
output from the fan motor.
Yes
Is the fan motor power supply voltage
~325Vdc (pin1 & 4) generated?
Yes
Stop the fan motor.
Rotate the fan motor by hand, is the
rotation feedback voltage 15Vdc
(pin6 & 4) generated?
Turn OFF the power and
disconnect the fan motor
connector. Turn ON the power.
Operate the fan motor, is the
rotation command voltage 1-5Vdc
(pin7 & 4) generated?
No
Replace the fan motor.
Yes
Replace the fan motor.
Replace the outdoor unit
PCB (main).
Self-diagnosis Method
Input Over Current Detection (F16)
Malfunction Decision Conditions:
During operation of cooling and heating, when outdoor current above 27.9A is detected by the current
transformer (CT) in the outdoor unit PCB.
Malfunction Caused:
1. Excessive refrigerant.
2. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 3 times in 20 minutes.
Self-diagnosis Method
Input Over Current Detection (F16)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Get restarted and measure
the AC current from the
outdoor LIVE terminal.
Is the measured AC current
over 27.9A?
No
Replace the outdoor unit
PCB (main).
Yes
Reclaim and recharge with
correct amount of refrigerant.
Yes
Check refrigerant amount.
Excess refrigerant?
No
Replace the outdoor unit
PCB (main).
Self-diagnosis Method
Compressor Overheating (F20)
Malfunction Decision Conditions:
During operation of cooling and heating, when temperature above 112 oC is detected by the compressor tank
temperature sensor.
Malfunction Caused:
1. Faulty compressor tank temperature sensor.
2. 2/3 way valve closed.
3. Refrigerant shortage (refrigerant leakage).
4. Clogged expansion valve or strainer.
5. Faulty outdoor unit PCB (main).
6. Faulty compressor.
Abnormality Judgment:
Continue 4 times in 30 minutes.
Self-diagnosis Method
Compressor Overheating (F20)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the compressor tank
temperature sensor.
Does it conform to the
sensor characteristic chart?
No
Replace the compressor tank
temperature sensor.
Yes
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
Check the 2/3 way valve.
Yes
No
Yes
Open the 2/3 way valve.
Is the 2/3 way valve closed?
Reclaim and recharge for a
specified amount of fresh refrigerant.
No
Is abnormality happened
again?
Check for gas leakage.
- Replace expansion valve
and/or strainer
- Reclaim and recharge
refrigerant
Yes
- Replace the outdoor unit
PCB (main)
- Replace the compressor
No
Is the oil oozing out from
the 2/3 way valve?
No
Yes
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Procedure complete
Self-diagnosis Method
IPM Overheating (F22)
Malfunction Decision Conditions:
During operation of cooling and heating, when temperature 95 oC is detected by the outdoor IPM temperature
sensor.
Malfunction Caused:
1. Faulty outdoor unit fan motor.
2. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 3 times in 30 minutes.
Self-diagnosis Method
IPM Overheating (F22)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the outdoor unit
installation condition.
Is there any improper heat
radiation?
Yes
- Reinstall the outdoor unit
- Remove the obstacle(s)
No
Replace the outdoor unit
fan motor.
No
Is the outdoor unit fan
motor operating?
Yes
- Defect in IPM
- Replace the outdoor unit
PCB (main)
Self-diagnosis Method
Output Over Current Detection (F23)
Malfunction Decision Conditions:
During operation of cooling and heating, when outdoor DC current is above 40.1 ± 5.0A (for: UD07~09CE) OR
44.7 ± 5.0A (for: UD12~16CE) is detected by the IPM DC Peak sensing circuitry in the outdoor unit PCB
(main).
Malfunction Caused:
1. Faulty outdoor unit PCB (main).
2. Faulty compressor.
Abnormality Judgment:
Continue for 7 times.
Self-diagnosis Method
Output Over Current Detection (F23)
Troubleshooting:
Check the compressor winding resistance:
- Turn OFF the power and disconnect the
harnesses U, V, and W
- Measure the winding resistance between
U-V, V-W, and W-U
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Are the compressor’s
winding resistance (U-V, VW, or U-W) shorted?
No
Yes
- Compressor defective due to
winding shorted
- Replace the compressor
- Outdoor electronic circuit
defect due to power transistor
shorted
- Replace the outdoor unit
PCB (main)
Self-diagnosis Method
Refrigeration Cycle Abnormality (F24)
Malfunction Decision Conditions:
1. During operation of cooling and heating, compressor frequency > Frated.
2. During operation of cooling and heating, running current: 0.65A < I < 1.65A.
3. During operation of cooling, water inlet temperature - indoor refrigerant liquid temperature < 5oC.
4. During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5oC.
Malfunction Caused:
1. Faulty water inlet or indoor refrigerant liquid temperature sensors.
2. 2/3 way valve closed.
3. Refrigerant shortage (refrigerant leakage).
4. Clogged expansion valve or strainer.
5. Faulty outdoor unit PCB (main).
6. Poor compression of compressor.
Abnormality Judgment:
Continue 2 times in 20 minutes.
Self-diagnosis Method
Refrigeration Cycle Abnormality (F24)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the water inlet and indoor
ref. liquid temperature sensors.
Does it conform to the
sensor characteristic chart?
No
Replace the water inlet or indoor
ref. liquid temperature sensor.
Check for clogged
expansion valve or strainer.
Yes
Is the expansion valve or
strainer clogged (ice formed)?
Check the 2/3 way valve.
Yes
No
Yes
Open the 2/3 way valve.
Is the 2/3 way valve closed?
- Replace expansion valve
and/or strainer
- Reclaim and recharge
refrigerant
Reclaim and recharge for a
specified amount of fresh refrigerant.
No
Is abnormality happened
again?
Check for gas leakage.
Is the oil oozing out from
the 2/3 way valve?
No
Yes
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Yes
- Replace the outdoor unit
PCB (main)
- Replace the compressor
No
Procedure complete
Self-diagnosis Method
Four Way Valve Abnormality (F25)
Malfunction Decision Conditions:
1. During heating operation, when the indoor pipe temperature of thermostat ON indoor unit < 0 oC.
2. During cooling operation, when the indoor pipe temperature of thermostat ON indoor unit > 45 oC.
Malfunction Caused:
1. Faulty sensor.
2. Faulty connector connection.
3. Faulty outdoor unit PCB (noise filter/main).
4. Faulty four way valve.
Abnormality Judgment:
Continue 4 times in 30 minutes.
Self-diagnosis Method
Four Way Valve Abnormality (F25)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Four way valve coil
disconnected (loose)?
Check the indoor pipe
temperature sensor.
Does it conform to the
sensor characteristic chart?
Correct the four way valve
coil.
No
Is the harness out of the
CN-HOT connector?
No
Replace the indoor pipe
temperature sensor.
Yes
Yes
Reconnect the harness.
No
Check the continuity of the
four way valve coil.
Yes
Is F25 occur during heating
operation?
Disconnect the harness from the
CN-HOT connector. Resistance
between harness about 1.52k ohm?
No
Is the four way valve coil energize
during cooling operation?
Yes
Yes
Replace the outdoor unit
PCB (noise filter/main).
No
Replace the four way valve.
No
Replace the four way valve
coil.
Yes
Measure AC voltage supply to CNHOT (pin1 & 3) during heating
operation.
Is the voltage supply to four
way valve 230Vac?
No
Replace the outdoor unit
PCB (noise filter/main).
Yes
Replace the four way valve.
Self-diagnosis Method
Outdoor High Pressure Switch Abnormal (F27)
Malfunction Decision Conditions:
During compressor stop, and outdoor high pressure switch is remain opened.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty switch.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 1 minute.
Self-diagnosis Method
Outdoor High Pressure Switch Abnormal (F27)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the CN-PSW1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-PSW1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the continuity of the outdoor high
pressure switch:
- Plug out outdoor high pressure switch
connector from CN-PSW1 channel
- Measure the connector continuity
(normally close)
Yes
Is there any continuity?
No
- Defect in outdoor unit PCB
(main)
- Replace the outdoor unit
PCB (main)
- Defect in outdoor high
pressure switch
- Replace the outdoor high
pressure switch
Multimeter
Self-diagnosis Method
Outdoor Air Temperature Sensor Abnormality (F36)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature
sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Outdoor Air Temperature Sensor Abnormality (F36)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the outdoor air temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor air
temperature sensor
Is the measured resistance of the
outdoor air temperature sensor
matches the value specified in its
characteristic chart?
No
- Defect in outdoor air temperature
sensor
- Replace the outdoor air
temperature sensor
Yes
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Self-diagnosis Method
Indoor Water Inlet Temperature Sensor Abnormality (F37)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor water inlet
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Indoor Water Inlet Temperature Sensor Abnormality (F37)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the indoor water inlet temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor water inlet
temperature sensor
Is the measured resistance of the
indoor water inlet temperature sensor
matches the value specified in its
characteristic chart?
No
- Defect in indoor water inlet
temperature sensor
- Replace the indoor water inlet
temperature sensor
Yes
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Self-diagnosis Method
Outdoor Discharge Pipe Temperature Sensor Abnormality (F40)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Outdoor Discharge Pipe Temperature Sensor Abnormality (F40)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-DIS connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-DIS connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the outdoor discharge pipe temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor discharge
pipe temperature sensor
Is the measured resistance of the
outdoor discharge pipe temperature
sensor matches the value specified
in its characteristic chart?
No
- Defect in outdoor discharge pipe
temperature sensor
- Replace the outdoor discharge pipe
temperature sensor
Yes
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Self-diagnosis Method
Power Factor Correction (PFC) Abnormality (F41)
Malfunction Decision Conditions:
During operation of cooling and heating, when the PFC protection circuitry in the outdoor unit PCB (main)
senses abnormal high DC voltage level.
Malfunction Caused:
1. Power supply surge.
2. Compressor windings not uniform.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 10 minutes.
Self-diagnosis Method
Power Factor Correction (PFC) Abnormality (F41)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Troubleshooting:
Check the supply voltage.
No
Supply voltage as specified?
Correct the power supply.
Check the compressor winding resistance:
- Turn OFF the power supply and disconnect
the harnesses U, V, and W
- Measure the winding resistance between UV, V-W, and W-U
Yes
Are the compressor’s winding
resistance (U-V, V-W, U-W)
uniform?
Operate the system. Verify PFC
abnormality by measuring the DC
voltage between DCP-OUT and DCNOUT of the outdoor unit PCB (main).
No
Replace the compressor.
Is the DC voltage between DCPOUT and DCN-OUT normal
(between 285-315Vdc)?
No
Yes
- Defect in PFC circuitry
- Replace the outdoor unit
PCB (main)
Yes
Replace the outdoor unit
PCB (main).
Self-diagnosis Method
Outdoor Pipe Temperature Sensor Abnormality (F42)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Outdoor Pipe Temperature Sensor Abnormality (F42)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the outdoor pipe temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor pipe
temperature sensor
Is the measured resistance of the
outdoor pipe temperature sensor
matches the value specified in its
characteristic chart?
No
- Defect in outdoor pipe temperature
sensor
- Replace the outdoor pipe
temperature sensor
Yes
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Self-diagnosis Method
Outdoor Defrost Temperature Sensor Abnormality (F43)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor defrost
temperature sensor are used to determine sensor errors.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Outdoor Defrost Temperature Sensor Abnormality (F43)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH2 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH2 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the outdoor defrost temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor defrost
temperature sensor
Is the measured resistance of the
outdoor defrost temperature sensor
matches the value specified in its
characteristic chart?
No
- Defect in outdoor defrost
temperature sensor
- Replace the outdoor defrost
temperature sensor
Yes
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Self-diagnosis Method
Indoor Water Outlet Temperature Sensor Abnormality (F45)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor water outlet
temperature sensor are used to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Self-diagnosis Method
Indoor Water Outlet Temperature Sensor Abnormality (F45)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
No
- Connector poor contact
- Correct the connection
Yes
Check the indoor water outlet temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor water outlet
temperature sensor
Is the measured resistance of the
indoor water outlet temperature
sensor matches the value specified
in its characteristic chart?
No
- Defect in indoor water outlet
temperature sensor
- Replace the indoor water outlet
temperature sensor
Yes
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Self-diagnosis Method
Outdoor Current Transformer Open Circuit (F46)
Malfunction Decision Conditions:
A current transformer (CT) open circuit is detected by checking the compressor running frequency (≥ rated
frequency) and CT detected input current (< 0.65A) for continuously 20 seconds.
Malfunction Caused:
1. CT defective.
2. Faulty outdoor unit PCB (main).
3. Compressor defective (low compression).
Abnormality Judgment:
Continue 3 times in 20 minutes.
Self-diagnosis Method
Outdoor Current Transformer Open Circuit (F46)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Measure the current from
the outdoor LIVE terminal.
Operate heating operation.
When F46 occurs again, turn
OFF the power.
No
Is the current < 0.65A?
Check the 2/3 way valve.
- Defect in CT
- Replace the outdoor
unit PCB (main)
Yes
Yes
Is the 2/3 way valve closed?
Open the 2/3 way valve.
While the system is still in
heating operation, check the
discharge pressure.
No
Is the pressure unchanged (same
as when compressor stop)?
Check for gas leakage.
No
Replace the outdoor unit
PCB (main).
Yes
Is the oil oozing out from
the 2/3 way valve?
No
Turn ON the power, and
operate heating operation.
Yes
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
While the system is still in heating operation,
further check (by touching) if:
- Compressor discharge pipe is cold
- Compressor body is warm
to confirm the compressor low compression.
Yes
Replace the compressor.
Self-diagnosis Method
Cooling High Pressure Overload Protection (F95)
Malfunction Decision Conditions:
During operation of cooling, when pressure 4.0MPa and above is detected by outdoor high pressure sensor.
Malfunction Caused:
1. Dust accumulation in the outdoor unit heat exchanger.
2. Air short circuit at outdoor unit.
3. 2 way valve closed.
4. Faulty outdoor unit fan motor.
5. Clogged expansion valve or strainer.
6. Excessive refrigerant.
7. Faulty outdoor high pressure sensor.
8. Faulty outdoor unit PCB (main).
Self-diagnosis Method
Cooling High Pressure Overload Protection (F95)
Troubleshooting:
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Check the outdoor unit fan
motor operation.
Check the dust accumulation on the
outdoor unit heat exchanger.
Is the outdoor unit heat
exchanger dirty?
Is the outdoor unit fan
motor operate normally?
Yes
Clean the heat exchanger.
No
Replace the outdoor unit
fan motor and/or outdoor
unit PCB (main).
Yes
Check for clogged
expansion valve or strainer.
No
Check the outdoor air
passage.
Is the expansion valve or
strainer clogged (ice formed)?
Yes
Provide sufficient air
passage.
Is there any short circuit?
Yes
No
- Replace the expansion
valve and/or strainer
- Reclaim and recharge
refrigerant
Check refrigerant amount.
No
Check the 2 way valve.
Is the additional refrigerant
amount filled correctly?
Yes
Is the 2 way valve closed?
No
Open the 2 way valve.
Yes
No
Reclaim and recharge with
correct amount of refrigerant.
- Replace the outdoor unit
PCB (main)
- Replace the outdoor high
pressure sensor
Thank You