Service diagnosis 
%&
 
Code indication 
Description 
Reference
Page 
Indoor 
displaying 
panel 
Outdoor 
(LED1 flash 
times) 
Indoor  ˂ Outdoor 
E7 15 
Communication fault between indoor and 
outdoor unit 
Page . 
Indoor Malfunction 
E1  /  Room temperature sensor failure  Page . 
E2  /  Heat-exchange sensor failure  Page . 
E4  /  Indoor EEPROM error  Page . 
E14  /  Indoor fan motor malfunction  Page . 
Outdoor 
Malfunction 
F12  1  Outdoor EEPROM error  Page . 
F1  2  The protection of IPM  Page . 
F22 3 
Over-current protection of AC electricity for   
the outdoor module 
Page . 
F3 4 
Communication fault between the IPM and 
outdoor PCB 
Page . 
F19  6  Power voltage is too high or low  Page . 
F27 7 
Compressor is lock-rotor or stopped 
momentary 
Page . 
F4  8  Overheat protection for discharge temperature  Page . 
F8  9  Outdoor DC fan motor fault  Page . 
F21 10 Defrost temperature sensor failure  Page . 
F7 11 Suction temperature sensor failure  Page . 
F6 12 Ambient temperature sensor failure  Page . 
F25 13 Discharge temperature sensor failure  Page . 
F13  16  Short of refrigerant  Page . 
F11  18  Deviate from the normal for the compressor  Page . 
F28  19  Loop of the station detect error  Page . 
/  21  Over load protection of indoor system  Page . 
F2  24  Over-current of the compressor  Page . 
F23 25 
Over-current protection for single-phase of the 
compressor 
Page . 
F43  46  Mismatch between indoor and outdoor units  Page . 
Domestic air conditioner