43
Maintenance
4.9 27M - 35M - 70M - 105M - 140M -160M 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
EC Detection of refrigerant leaks OFF 7 times
EE Water level alarm malfunction OFF 8 times
E8
Communication error between master and slave units (for twin
configuration)
OFF 9 times
E9 Other malfunction of indoor units (for twin configuration) OFF 10 times
Ed Faulty outdoor unit (due to the old communication protocol) OFF 11 times
F0 Overcurrent protection (for some units) 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 T5 circuit open or in short circuit ON 4 times
F4 External EEPROM malfunction (for some units) ON 5 times
F5 External fan speed malfunction ON 6 times
F6
Temperature sensor T2B circuit open or in short circuit (for free-
match indoor units)
ON 7 times
F7
Communication error between the automatic lifting panel and
the slim box
ON 8 times
F8
Faulty automatic lifting panel (for slim box with automatic lifting
panel)
ON 9 times
F9
Automatic lifting panel not closed (for slim box with automatic
lifting panel)
ON 10 times
FA
Communication malfunction between two internal chips (for
DUCT-SL 2)
ON 11 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
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