27
Maintenance
4.8 Indoor unit error codes
Error code Cause Timer light
“Operation
light (flashes)”
E0 Internal EEPROM malfunction OFF Once
E1
Communication malfunction between the indoor unit and the
outdoor unit
OFF Twice
E3 Internal fan speed malfunction OFF 4 times
E4 Temperature sensor T1 circuit open or in short circuit OFF 5 times
E5 Temperature sensor T2 circuit open or in short circuit OFF 6 times
Eb Communication error between display board and main board - -
EC Detection of refrigerant leaks OFF 7 times
F0 Overcurrent protection ON Once
F1 Temperature sensor T4 circuit open or in short circuit ON Twice
F2 Temperature sensor T3 circuit open or in short circuit ON 3 times
F3 Temperature sensor TP circuit open or in short circuit ON 4 times
F4 External EEPROM malfunction ON 5 times
F5 External fan speed malfunction ON 6 times
P0 IPM module malfunction FLASHING Once
P1 DC voltage protection too high/too low FLASHING Twice
P2 Maximum compressor temperature protection FLASHING 3 times
P3* Low room temperature protection FLASHING 4 times
P4 Compressor inverter drive protection FLASHING 5 times
P6 Compressor low pressure protection FLASHING 7 times
P7 Faulty external IGBT sensor FLASHING 8 times
P3*
– The indoor unit displays the error code P3, in heating mode, when the outdoor temperature is lower than
LowHeatPreTemp°C for 1 hour
– The unit will start working again if the outdoor temperature is higher than LowHeatPreTemp3°C for 10 minutes and
the compressor stops for 1 hour or the outdoor temperature is higher than LowHeatPreTempTempTemp20°C for
10 minutes
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