Model reference

LG AVMWH020CA0G

Heat Pump

1 document153 error codes4 service modes

Available documentation

Service Manual

LG Samsung AVMWH020CA0G Service Manual Troubleshooting118 pg
Covers this model

MyPros+ Max

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Test values, resistance specs, and wiring references
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Indoor unit EVAP IN sensor breakaway

From Service Manual 644865, p.37:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure door lock assembly resistance across PTC terminals. Expected: ~200 ohms cold.

3.Inspect strike and latch alignment. A misaligned strike prevents the switch stack from closing.

Part 6601ER1004C

Door lock assembly

Error codes (153)

CodeMeaning

AxIndoor unit EVAP IN sensor breakaway for unit x.BxOPEN/SHORT error of EVAP OUT sensor in indoor unit x.ChCompressor preheating in progress CxOPEN/SHORT error of room sensor in indoor unit x.DxOPEN/SHORT error of EVAP IN sensor in indoor unit x.E1System down due to communication error after completion of tracking (no…E101Communication error between the indoor unit and the Panel (PAC).E102Indoor unit room temperature sensor open/short error.E103Indoor unit EVAP IN sensor open/short error.E104Indoor unit EVAP OUT sensor open/short error.E105Indoor unit EVAP IN sensor breakaway.E106Indoor unit EVAP OUT sensor breakaway.E107Simultaneous breakaway of indoor unit EVAP IN/OUT sensor.E108Auxiliary (electric) heater sensor 1 error.E109Auxiliary (electric) heater sensor 2 error.E110Auxiliary (electric) heater sensor 3 error.E121MCU temperature sensor open/short error.E151Indoor unit EEV open failure.E152Indoor unit EEV close failure.E153Indoor unit float switch detection error.E154Indoor fan error.E155Mixed operation error (operating heat and cool mode at the same time).E156EEPROM error.E157Option setting error.E160The 1st MCU SOL V/V cooling/heating opening at the same time.E161The 2nd MCU SOL V/V cooling/heating opening at the same time.E162The 2nd MCU SOL V/V error.E2Tracking error E201Installed indoor unit number setting error.E202Communication error between indoor and outdoor unit.

View all 153 error codes

E203Outdoor PCB MICOM communication error between main and sub.E204Communication error between the outdoor unit and MCU.E205Indoor unit connected with confluence kit without continuity.E206Indoor unit connected with confluence kit and setting address was overlapped…E207MCU address does not match with indoor unit address.E208Installed MCU quantity setup error in the outdoor PCB.E209MCU address setting was overlapped.E210Rotary switch for indoor unit address in MCU was overlapped among MCUs.E211DIP switch for indoor unit setting was ON position even though indoor unit was…E212DIP switch for indoor unit setting was OFF position even though indoor unit was…E261Digital discharge sensor breakaway.E262Fixed 1 discharge sensor breakaway.E263Fixed 2 discharge sensor breakaway.E264Fixed 3 discharge sensor breakaway.E265Sump-main breakaway error.E266Sump Sub 1 breakaway error.E267Sump Sub 2 breakaway error.E268Sump Sub 3 breakaway error.E269Suction breakaway error.E3Indoor unit float switch error (float switch open for longer than 1 minute).E301OUT-TEMP sensor OPEN/SHORT error.E302OUT-TEMP temperature sensor breakaway.E303COND-OUT MAIN temperature sensor error OPEN/SHORT.E304COND-OUT SUB 1 temperature sensor error OPEN/SHORT.E305COND-MID sensor breakaway of outdoor unit.E306COND-OUT 1 breakaway.E307PWM discharge temperature sensor error OPEN/SHORT (detected when outdoor temp…E308Fixed capacity compressor 1 discharge sensor error OPEN/SHORT (detected when…E309Fixed capacity compressor 2 discharge sensor error OPEN/SHORT (detected when…E310Fixed capacity compressor 3 discharge sensor error OPEN/SHORT (detected when…E321SUMP TEMP DIGITAL sensor error OPEN/SHORT (detected when outdoor temp over…E322SUMP TEMP FIXED 1 sensor error OPEN/SHORT (detected when outdoor temp over…E323SUMP TEMP FIXED 2 sensor error OPEN/SHORT (detected when outdoor temp over…E324SUMP TEMP FIXED 3 sensor error OPEN/SHORT (detected when outdoor temp over…E351High pressure sensor error OPEN/SHORT (SHORT below 0.4V, OPEN over 4.2V…E352Low pressure sensor error OPEN/SHORT (SHORT below 0.4V, OPEN over 4.7V…E353High pressure sensor breakaway.E354Low pressure sensor breakaway.E355Suction temperature sensor ERROR (OPEN/SHORT).E356Main cooling solenoid valve open error.E3574-Way valve operation error.E4Mismatching of set indoor unit numbers with communicated numbers after 5 times…E401Outdoor unit freezing detection 1.E402Outdoor unit freezing detection 2.E403Outdoor unit freezing detection 3 E404Outdoor unit overload 1 protection control error.E405Outdoor unit overload 2 protection control error.E406Outdoor unit overload 3 protection control error.E407Compressor down by high pressure sensor protection control 1.E408Compressor down by high pressure sensor protection control 2.E409Compressor down by high pressure sensor protection control 3.E410Compressor down by low pressure sensor protection control 1.E411Compressor down by low pressure sensor protection control 2.E412Compressor down by low pressure sensor protection control 3.E413Outdoor unit SUMP DOWN 1 protection control.E414Outdoor unit SUMP DOWN 2 protection control.E415Outdoor unit SUMP DOWN 3 protection control.E416Outdoor unit discharge temperature 1 protection control.E417Outdoor unit discharge temperature 2 protection control.E418Outdoor unit discharge temperature 3 protection control.E419Outdoor unit EEV open 1 self diagnosis error.E420Outdoor unit EEV open 2 self diagnosis error.E421Outdoor unit EEV open 3 self diagnosis error.E422Outdoor unit EEV close 1 self diagnosis error.E423Outdoor unit EEV close 2 self diagnosis error.E424Outdoor unit EEV close 3 self diagnosis error.E425Outdoor unit reverse phase detection 1 error (3-phase L1/L2/L3 connection error…E426Outdoor unit reverse phase detection 2 error.E427Outdoor unit reverse phase detection 3 error.E428Outdoor unit compression rate 1 error (compression ratio over 8.5 for more than…E429Outdoor unit compression rate 2 error.E430Outdoor unit compression rate 3 error.E5Setting error of option switch in indoor unit (wired remote controller address…E601Communication error between wired remote controller and indoor unit.E602Communication error between master wired remote controller and slave wired…E603Communication error between 7-day scheduler and wired remote controller.FxIndoor unit EVAP OUT sensor breakaway for unit x.G2Total leakage of refrigerant in outdoor unit or loading failure.G3Breakaway of COND MID sensor in outdoor unit.G4Breakaway of oil temperature sensor (detected once or more times during first…G5Breakaway of suction temperature sensor.G6Breakaway of fixed compressor discharge sensor (detected once or more times).G7Restriction of cooling operation when outdoor temperature is below -5°C.G8Restriction of heating operation when outdoor temperature is over 30°C, or…G9Suction temperature sensor OPEN/SHORT error.P0System down due to high temperature of discharge sensor (exceeding 135°C).P1System down due to high temperature of condenser sensor (condensate temperature…P2SUMP COMP DOWN P3System down due to low pressure switch detection (low pressure lower than 1.2…P4Reverse phase or open phase error on 3-phase power supply to outdoor unit.P431Forbid heating mode operation when outdoor temperature over 30°C.P432Forbid cooling mode operation when outdoor temperature below -5°C.P434Instant power off (disappears when compressor runs).P5System down due to frozen heat exchanger (indoor unit heat exchanger…P501Defrosting operation (not error).P502Low discharge pressure (high pressure of 9 kg/cm² for 10 minutes).P503Equability/Oil leveling operation (not error).P504Loading failure of digital compressor.P505Full leakage of refrigerant of outdoor unit.P6Defrost operation in progress (not a defect).P7Error of momentary power failure P701Float switch detection error (low level risk P702Indoor unit EEV closing error (low level risk).P703Indoor unit EEV opening error (low level risk).P704MCU solenoid valve failure (low level risk).P8Compressor down due to high pressure sensor protection control (over 28…P9Compressor down due to low pressure sensor protection control (less than 3…PACompressor down due to protection control of condensation ratio (compression…qxElectronic expansion valve open error for indoor unit x.rxElectronic expansion valve close error for indoor unit x.sxSimultaneous breakaway of indoor unit EVAP IN and EVAP OUT sensor for unit x.t1Outdoor temperature sensor OPEN/SHORT error (over 4.9V/-50°C or below…t2Condenser temperature sensor OPEN/SHORT error (over 4.9V/-50°C or below…t3PWM discharge temperature sensor OPEN/SHORT error (detected when outdoor temp…t4Liquid refrigerant pipe (COND OUT) temperature sensor OPEN/SHORT error (over…t5Oil temperature sensor OPEN/SHORT error (detected when outdoor temp over -10°C…t6Suction temperature sensor OPEN/SHORT error (over 4.9V/-50°C or below…t7High pressure sensor OPEN/SHORT error (detected when compressor is on; SHORT…t8Low pressure sensor OPEN/SHORT error (detected when compressor is on; SHORT…t9Fixed compressor discharge sensor OPEN/SHORT error (detected when outdoor temp…toLow pressure sensor breakaway.tuHigh pressure sensor breakaway.vxError of fan starting for indoor unit x.

Service modes (4)

Error resetPress reset key KEY 3 (K3) on outdoor unit PCB.
Piping checkInitiate piping check procedure; press KEY 5 (K5) after pipe check to display error information.
S-NET diagnosticsConnect S-NET monitoring tool to the DVM system.
Test operationPress KEY 4 (K4) on outdoor unit PCB.

Full entry steps, exit procedures, and test sequences are available in Max.

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