42
Maintenance
4.8 53M indoor unit error codes
Error code Cause Timer light
“Operation
light (flashes)”
E0/EA Indoor unit EEPROM parameter error OFF Once
E1
Communication error between the indoor unit and the outdoor
unit
OFF Twice
E3 Internal fan speed outside the normal range OFF 4 times
E4
Indoor room temperature sensor T1 circuit open or in short
circuit
OFF 5 times
E5
T2 evaporator coil temperature sensor circuit open or in short
circuit
OFF 6 times
EC Detection of refrigerant leaks (for some models) OFF 7 times
EE Water level alarm malfunction OFF 8 times
F0 Current overload protection ON Once
F1
Outdoor room temperature sensor T4 circuit open or in short
circuit
ON Twice
F2
T3 condenser coil temperature sensor circuit open or in short
circuit
ON 3 times
F3
TP compressor drain temperature sensor circuit open or in short
circuit
ON 4 times
F4 Outdoor unit EEPROM parameter error ON 5 times
F5 External fan speed outside the normal range (for some models) ON 6 times
FA
Communication error between two internal chips (for some
models)
ON 11 times
P0 IPM malfunction or IGBT overcurrent protection FLASHING Once
P1 Over-voltage/under-voltage protection FLASHING Twice
P4 Compressor inverter drive error FLASHING 5 times
P5 Indoor unit mode conflict (combination with MULTI outdoor unit) FLASHING 6 times
P6 Low pressure protection (for some models) FLASHING 7 times
P7 IPM module high temperature protection (for some models) FLASHING 8 times
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