Acson AC Error Codes and Troubleshooting

Acson AC Error Codes and Troubleshooting


Wall Mounted AC Inverter Unit
Error CodesOperation / Faulty Indication
E1Room air sensor contact loose / short. Check room sensor connection / change room sensor
E2Indoor coil sensor contact open. Check indoor coil sensor connection / change indoor coil sensor
E3Outdoor coil sensor contact open. Check outdoor coil sensor connection / change outdoor coil sensor
E4Compressor overload protection / Indoor / Outdoor coil sensor short. If running ampere highly increase, change the compressor. If not, replace the coil sensor
E5Gas leak. Check for leakage & repair / Top up refrigerant
E6Pump fault. Clear the clogging at drain pipe. If pump is not working, change the pump
E7Outdoor coil sensor exist (MS model). Remove outdoor coil sensor
E8Hardware error (tact switch pin short). Check for the tact switch pin condition
E9No Feedback from indoor fan. Check indoor fan motor / fan motor wiring
EEEEPROM defrost
Error Codes for G18 and GS02 – Inverter Y Models
Netware 3C / SLM 9 – Inverter Y Models (Except 5WMY-J/JR)
N3C – SLM 9 – Inverter Y Models

Error CodesProblem
00Normal
U0Insufficient gas
U2DC voltage out of range
U4Communication error
U7Signal transmission error (on outdoor unit PCB)
UAInstallation error
UFCommunication Error (indoor and outdoor) piping and wiring
UHAnti-freeze function in other room
A1Indoor PCB error
A3Water pump error
A5Antifreeze
A6Indoor fan motor abnormal
C4Indoor heat exchanger thermistor short/ open
C9Indoor room thermistor short/ open
E1Outdoor PCB error
E3High pressure protection
E4Low pressure protection
E5Compressor motor lock
E6Compressor start-up error
E7Outdoor DC fan motor lock
E8Ac input over current
E9EXV error
EA4-way valve error
F3Discharge pipe overheat
F6Heat exchanger overheat
H0Compressor sensor system abnormality
H3High pressure switch error
H6Position sensor abnormality
H8AC current sensor error
H9Outdoor air thermistor short / open
J1Pressure sensor error
J3Compressor discharge pipe thermistor short /open / misplaced
J5Suction pipe thermistor short/ open
J6Outdoor heat exchanger
J7Subcooling heat exchanger thermistor short/ open
J8Liquid pipe thermistor short/ open
J9Gas pipe thermistor abnormality
LCCommunication error (control PCB and inverter PCB)
L1Outdoor PCB error
L3Electrical box temperature rise
L4Heat sink overheat
L5IPM error / IGBT error
L9Stall prevention
P1Open phase or voltage unbalance
P4Heat sink thermistor short / open
PJCapacity setting error
Sequential Controller (SQ LCD) – SB & RT Multi Compressors
Error CodesFaulty Indication
E01Require manual reset (possible causes)
E02Compressor 1 high temperature (overload)
E03Compressor 2 high temperature (overload)
E04Compressor 3 high temperature (overload)
E05Compressor 4 high temperature (overload)
E06Compressor 1 high pressure trip / contact open
E07Compressor 2 high pressure trip / contact open
E08Compressor 3 high pressure trip / contact open
E09Compressor 4 high pressure trip / contact open
E10Compressor 1 trip/low refrigerant/outdoor abnormal
E11Compressor 2 trip/low refrigerant/outdoor abnormal
E12Compressor 3 trip/low refrigerant/outdoor abnormal
E13Compressor 4 trip/low refrigerant/outdoor abnormal
E14Room sensor short
E15Room sensor open
E16Indoor coil sensor 1 short
E17Indoor coil sensor 2 short
E18Indoor coil sensor 3 short
E19Indoor coil sensor 4 short
E20Indoor coil sensor 1 open
E21Indoor coil sensor 2 open
E22Indoor coil sensor 3 open
E23Indoor coil sensor 4 open
E24Outdoor coil sensor 1 short
E25Outdoor coil sensor 2 short
E26Outdoor coil sensor 3 short
E27Outdoor coil sensor 4 short
E28Outdoor coil sensor 1 open
E29Outdoor coil sensor 2 open
E30Outdoor coil sensor 3 open
E31Outdoor coil sensor 4 open
E32Compressor 1 de-ice
E33Compressor 2 de-ice
E34Compressor 3 de-ice
E35Compressor 4 de-ice
Error Diagnosis by Wired Controller (MC301)


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