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W-2WAY ECO-i SYSTEM
Trouble Diagnosis
4. W-2WAY ECO-i Alarm Codes
With type 96, the INV compressor is compressor 1, and the constant-speed
compressor is compressor 2.
With type 72, the INV compressor is compressor 1.
Alarm code Alarm meaning Page
E06 Outdoor unit failed to receive serial communication signals from indoor unit. 5-9
E12 Automatic address setting start is prohibited. 5-9
E15 Automatic address setting alarm (too few units) 5-9
E16 Automatic address setting alarm (too many units) 5-10
E20 No indoor units at automatic address setting. 5-10
E24 Outdoor unit (INV) failed to receive communications from another outdoor
unit (constant-speed).
5-10
E25 Outdoor unit address setting failure (duplication) 5-11
E26 Mismatch in outdoor unit quantity 5-11
E29 Outdoor unit failed to receive communication from outdoor unit (main) 5-11
F04 Compressor 1 discharge temperature sensor trouble 5-12
F05 Compressor 2 discharge temperature sensor trouble 5-12
F06 Gas temperature sensor trouble at outdoor heat exchanger 1 (In) 5-13
F07 Liquid temperature sensor trouble at outdoor heat exchanger 1 (Out) 5-13
F08 Outdoor air temperature sensor trouble 5-14
F12 Compressor intake temperature sensor trouble 5-14
F16 High-pressure sensor trouble 5-15
F17 Low-pressure sensor trouble 5-16
F23 Gas temperature sensor trouble at outdoor heat exchanger 2 (In) 5-13
F24 Liquid temperature sensor trouble at outdoor heat exchanger 2 (Out) 5-13
F31 Outdoor unit non-volatile memory (EEPROM) trouble 5-16
H11 Constant speed compressor 2 overcurrent alarm 5-17
H12 Constant speed compressor 2 lock current alarm 5-17
H03 Compressor 1 CT sensor disconnected or short-circuit 5-18
H06 Low-pressure switch activated 5-19
H07 No-oil alarm 5-20
H08 Compressor 1 oil detection sensor (connection) trouble 5-21
H13 Compressor 2 CT sensor disconnected or short-circuit 5-18
H15 Compressor 2 discharge temperature sensor disconnected 5-18
H27 Compressor 2 oil detection sensor (connection) trouble 5-21
H31 HIC trouble alarm 5-21
L04 Outdoor system address duplication 5-22
L10 Outdoor unit capacity not set 5-22
L17 Outdoor unit model mismatch 5-22
L18 4-way valve operation failure 5-22