Haier AU222XFERA User Manual - Page 17

Trouble shooting FAILURE STATE OF CODE LED 5-4-3-2-1 TROUBLE SHOOTING 1 Faulty defrost sensor Te 2 Faulty sensor Tao POSSIBLE REASONS Sensor disconnected, or broken, or short circuit Sensor disconnected, or broken, or short circuit 3 Faulty sensor Ts Sensor disconnected, or broken, or short circuit 4 Faulty sensor Td Sensor disconnected, or broken, or short circuit Over current of the system, or broken of the current 5 Input overcurrent sensor,or malfunction with indoor or outdoor fan motors, or faulty PCB. Abnormal communication Wrong connection, or the wires be disconnected, or 6 between indoor and outdoor wrong address setting of indoor units, or faulty units PCB, or faulty power supply High pressure switch is disconnected, or high 9 System high pressure protection pressure switch worked, or Tc too high and faulty outdoor fan motor when cooling, or faulty indoor fan motors when heating, or refrigerant overabundance Low pressure switch is disconnected, or low 10 System low pressure protection pressure switch worked, or Te too low and faulty outdoor fan motors when heating, or faulty indoor fan motor when cooling, or refrigerant shortage IPM over current, or short circuit, or IPM 11 IPM protection temperature too high, or IPM input voltage too low,or faulty SPDU. 12 EEPROM fault Faulty outdoor unit PCB 13 Over hot protection of compressor Serious lack of refrigerant of the system, or the ambient temperature too high, or PMVs be blocked 15 DC fan motor fault Fan is blocked, or the terminal is disconnected from the PCB 16 Faulty 4-way valve switching on Coil of 4-way valve is disconnected, or faulty outdoor PCB 17 Faulty sensor Tc Sensor disconnected, or broken, or short circuit 21 Faulty sensor Toci Sensor disconnected, or broken, or short circuit 25 Abnormal communication between main PCB and SPDU Communication cables broken, or not be well connected, or faulty main PCB, or faulty SPDU 26 Compressor be locked Faulty compressor or SPDU 27 Compressor vibration too big Faulty compressor 28 Compressor lose position Faulty SPDU 29 Faulty compressor start Faulty compressor or SPDU 30 Faulty circuit position checking Faulty SPDU 31 Compressor broken Faulty compressor or SPDU Take off the plastic valve cover, you can find the LEDs near to the communication terminal. Symbol means the LED is ON. Symbol means the LED is OFF. 15