Haier AU342XHERA, AU282XHERA installation manual Failure State Trouble Possible Reasons Code

Trouble shooting

FAILURE	STATE OF	TROUBLE	POSSIBLE REASONS
CODE	LED 5-4-3-2-1	SHOOTING
1		Faulty defrost sensor Te	Sensor disconnected, or broken, or short circuit
2		Faulty sensor Tao	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
		System high pressure	pressure switch worked, or Tc too high and faulty
9			outdoor fan motor when cooling, or faulty indoor
		protection
			fan motors when heating, or refrigerant
			overabundance
			Low pressure switch is disconnected, or low
10		System low pressure	pressure switch worked, or Te too low and faulty
		protection	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(or ISPM).
12		EEPROM fault	Faulty outdoor unit PCB
		Over hot protection of	Serious lack of refrigerant of the system, or the
13			ambient temperature too high, or PMVs be
		compressor
			blocked
14		Over hot protection of SPDU Ambient tempreatrue too high, or outdoor fan be
		(or ISPM)	blocked, or bad air circulation of outdoor unit
15		DC fan motor fault	Fan is blocked, or the terminal is disconnected
			from the PCB
16		Faulty 4-way valve	Coil of 4-way valve is disconnected, or faulty
		switching on	outdoor PCB
17		Faulty sensor Tc	Sensor disconnected, or broken, or short circuit
21		Faulty sensor Toci	Sensor disconnected, or broken, or short circuit
23		Low voltage protection	VDC<194V, too low voltage from power source
24		High voltage protection	VDC>400V, too high voltage from power source
25		Abnormal communication	Communication cables broken, or not be well
		between main PCB and	connected, or faulty main PCB, or faulty SPDU(or
		SPDU(or ISPM)	ISPM)
26		Compressor be locked	Faulty compressor or SPDU(or ISPM)
27		Compressor vibration too big Faulty compressor
28		Compressor lose position	Faulty SPDU(or ISPM)
29		Faulty compressor start	Faulty compressor or SPDU(or ISPM)
30		Faulty position checking	Faulty SPDU(or ISPM)
31		circuit	Faulty compressor or SPDU(or ISPM)
		Compressor broken

Take off the plastic cover on the right side of the unit, you can find the LEDs near the communication terminal. Symbol means the LED is ON, and symbol means the LED is OFF.

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