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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