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Problem Solving using Error Code
Saijo Denki Inverter R-410A
Error Detection using Error Code from 7-SEG
Error Code Detection
Saijo Denki Inverter air conditioner can show error code in 2 ways
1. 7-SEG display at the indoor unit. We can check Error code by pressing CLR button in the
remote control 4 times continuously in 3 seconds.
2. Get Error Code from smart phone application “Saijo Denki Inverter – Engineer”.
7-SEG display at
indoor unit
Show Error
LED Display at indoor unit
LED POWER.
LED COMP.
OFF :
AC OFF
ON :
ON :
AC ON
BLINK very frequently : Indoor unit can
not communicate with Outdoor unit
BLINK 3 times: Room temperature
thermistor fail
BLINK 4 times: Indoor Inlet temperature
sensor fail
Compressor ON
BLINK slowly: Air Conditioner in Error.
Please press CLR button at remote control 4
times in 3 seconds to check Error Code at 7SEG of indoor unit
Error Code Table is at every indoor unit.
Status
Number of LED’s blink
Hot
LED1
Cool
comp/ power
Water floating
ID inlet fail
ID room tmp fail
OD comp top tmp fail
OD inlet tmp fail
OD discharge tmp fail
OD coil tmp fail
OD comp over
OD ctrl fail
OD comp wire fail
Sys liq qt fail
OD cooling fail
Water
OD
comp
floating
current fail
ID cooling fail
Restore the status by turn off air condition and press “CLR” 4 time at remote
Clear error code by press “CLR” 10 time consciously
Sensor Fail
Status
Number of LED’s blink
Hot
LED1
Cool
comp/ power
Water floating
ID inlet fail
ID room tmp fail
OD comp top tmp fail
OD inlet tmp fail
OD discharge tmp fail
OD coil tmp fail
OD comp over
OD ctrl fail
OD comp wire fail
Sys liq qt fail
OD cooling fail
Water
OD
comp
floating
current fail
ID cooling fail
Restore the status by turn off air condition and press “CLR” 4 time at remote
Error from Sensor Fail
Error 3,4,5,13,14,15: Room Temperature Sensor
Ambient sensor
Discharge sensor
Mid coil sensor
Replace / Connect
Sensor to indoor unit
Sensor is
broken or
damage
Room temp sensor
Yes
No
Mid cooling coil sensor
Change Indoor
PCB Board
Normal
Check
Sensor
Resistance
Change Room
temperature sensor
Abnormal
Resistance of Sensor is 5K at 25 c temperature
Error 17: Compressor Overload
Outdoor PCB detects Overcurrent to compressor
Air Flow at outdoor
unit is good or not ?
No
Make sure that
outdoor unit has
good air flow; remove
obstacle or clean
condenser coil
Yes
Check too much
refrigerant in the
system ?
Normal
Decrease refrigerant
in the air conditioner
Too much
Error 17: Compressor Overload (Cont)
Outdoor PCB detects Overcurrent to compressor
Supply Voltage must be
between 175-260 V
Check Power Line:
Supply Voltage is
between 175–260 V
?
Yes
Replace Outdoor
Control Box
Make sure supply
voltage is between 175
– 260 V
No
Error 11,18,19: Error in Outdoor control box
Error in Outdoor Control Box
Check if Electrical wiring
from compressor to
outdoor control box is
tight and U V W is in
order
Make tight wiring
and ensure U V
W is in order
No
Yes
Replace Outdoor
Control Box
Work Properly
Problem at
outdoor control
box
Problem at
compressor
No
Error 21: Wiring to compressor loosen
Error in Outdoor Control Box
Check if Electrical wiring
from compressor to
outdoor control box is
tight and U V W is in
order
Make tight wiring
and ensure U V
W is in order
No
Yes
Replace Outdoor
Control Box
Work Properly
Problem at
outdoor control
box
Problem at
compressor
No
Error 22,31 Discharge Over Temperature
Temperature
at Discharge Pipe is more than 100 c
t
Make sure outdoor air flow is
good and condenser coil is
clean
Check Outdoor Air
Flow ?
Not good
Good
Check (1) Too low
refrigerant (2) Clog
in refrigerant line ?
ไม่
Yes
Make sure refrigerant amount is
properly charge and no clog in
this system
Remark: if refrigerant too low,
also check leakage in the
system
Error 22,31 Discharge Over Temp. (Cont.)
Temperature
at Discharge Pipe is more than 100 c
t
Check Resistance
of Discharge Pipe
Sensor, ok ?
NO
Replace Discharge
Pipe sensor
OK
Replace Outdoor
Control Box
Normal Resistance (Ω) of sensor
Temperature
Resistance
25 c
5.00 K ohm
30 c
4.18 K ohm
35 c
3.51 K ohm
Error 23: Outdoor Mid Coil temperature too high
Temperature at Mid Coil Sensor is more than 60 c
Check Outdoor
motor
Replace Outdoor Motor
Abnormal
Normal
Check Outdoor
Air Flow
Abnormal
Normal
Improve Outdoor Air Flow;
remove obstacle to air flow
of outdoor unit and/or clean
condenser coil
Error 23: Outdoor Mid Coil temperature too high (Cont.)
Temperature at Mid Coil Sensor is more than 60 c
Clean Condenser
Condenser
block
Yes
No
Check too
much
refrigerant ?
Yes
No
Make sure refrigerant
amount is properly
charge
Error 23: Outdoor Mid Coil temperature too high (Cont.)
Temperature at Mid Coil Sensor is more than 60 c
Replace Outdoor
Mid Coil
Temperature
Abnormal Sensor
Check resistance of
outdoor mid coil
temperature sensor
Normal
Replace Outdoor Control Box
Error 24: Overcurrent
Current
is 130% of nominal current input
t
Check Outdoor Air
Flow is normal
Abnormal
Improve Outdoor Air
Flow; remove obstacle
to air flow of outdoor
unit and/or clean
condenser coil
Normal
Check refrigerant
amount is too much
or not ?
No
Make sure
refrigerant amount is
properly charge
Yes
Error 24: Overcurrent
tCurrent is 130% of nominal current input
Check current input
of compressor is
130% of nominal
current input ?
Yes
Replace Compressor
Replace Outdoor
Control Box
No
Error 26,27: Indoor Coil Frost
Indoor
Inlet Temperature is equal or below 0 c
t
Replace Indoor Fan
Motor
Check Indoor Fan
motor ?
Fail
Normal
Check Indoor Air
Flow is blocked ?
Block
No
Make sure Indoor
Air Flow is good;
clean evaporator
and/or clean indoor
filter
Error 26,27: Indoor Coil Frost
tIndoor Inlet Temperature is equal or below 0 c
Check Resistance
of Indoor Inlet
Sensor, ok ?
NO
Replace Discharge
Pipe sensor
OK
Replace Outdoor
Control Box
Normal Resistance (Ω) of sensor
Temperature
Resistance
25 c
5.00 K ohm
30 c
4.18 K ohm
35 c
3.51 K ohm