29
Maintenance
4.9 53M indoor unit error codes
Error
code
Cause Timer light
“Operation
light
(flashes)”
Solution
E0/EA Indoor unit EEPROM parameter error OFF Once TS18
E1
Communication error between the indoor unit and the
outdoor unit
OFF Twice TS19
E3 Internal fan speed outside the normal range OFF 4 times TS21
E4
Indoor room temperature sensor T1 circuit open or in
short circuit
OFF 5 times TS23
E5
T2 evaporator coil temperature sensor circuit open or in
short circuit
OFF 6 times TS23
EC Detection of refrigerant leaks (for some models) OFF 7 times TS24
EE Water level alarm malfunction OFF 8 times TS25
F0 Current overload protection ON Once TS26
F1
Outdoor room temperature sensor T4 circuit open or in
short circuit
ON Twice TS25
F2
T3 condenser coil temperature sensor circuit open or in
short circuit
ON 3 times TS25
F3
TP compressor drain temperature sensor circuit open or
in short circuit
ON 4 times TS25
F4 Outdoor unit EEPROM parameter error ON 5 times TS18
F5
External fan speed outside the normal range
(for some models)
ON 6 times TS21
FA
Communication error between two internal chips
(for some models)
ON 11 times --
P0 IPM malfunction or IGBT overcurrent protection FLASHING Once TS27
P1 Over-voltage/under-voltage protection FLASHING Twice TS28
P4 Compressor inverter drive error FLASHING 5 times TS29
P5
Indoor unit mode conflict (combination with MULTI
outdoor unit)
FLASHING 6 times --
P6 Low pressure protection (for some models) FLASHING 7 times TS30
P7
IPM module high temperature protection (for some
models)
FLASHING 8 times TS31