Blue Series Troubleshooting (9K & 12K)

NO.	Malfunction Name	Display Method of Indoor Unit				Display Method of Outdoor Unit			A/C Status	Possible Causes
		Dual-8 Code Display	Indicator Display			Indicator Display
			Operation Indicator	Cooling Indicator	Heating Indicator	Yellow Indicator	Red Indicator	Green Indicator
1	High pressure protection of system	E1	Off 3s and blink once						During cooling and drying operation, all loads except the indoor fan stop operation. During heating operation, the entire unit stops.	Refrigerant was superabundant; Poor heat exchange (including filth blockage of heat exchanger and bad radiating environment); Ambient temperature is too high.
2	Antifreezing protection	E2	Off 3s and blink twice			Off 1s and blink 3 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates.	Poor air-return in indoor unit; Fan speed is abnormal; Evaporator is dirty;
	System block or refrigerant leakage	E3	Off 3s and blink 3 times				Off 3s and blink 9 times		Dual-8 code display will show E3 until the low pressure switch stops operation.	Low-pressure protection Low-pressure protection of system Low-pressure protection of compressor
3	System block or refrigerant leakage	F0					Off 1s and blink 9 times		Dual-8 code display will show F0 until the low pressure switch stops operation.	Refrigerant leakage. Indoor evaporator temperature sensor is not working properly. The unit has been plugged up somewhere.
4	High discharge temperature protection of compressor	E4	Off 3s and blink 4 times			Off 1s and blink 7 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
5	Overcurrent protection	E5	Off 3s and blink 5 times			Off 1s and blink 5 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Supply voltage is unstable; Supply voltage is too low and load is too high; Evaporator is dirty;
6	Communication malfunction	E6	Off 3s and blink 6 times			Always On			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
7	High temperature resistant protection	E8	Off 3s and blink 8 times			Off 1s and blink 6 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
8	EEPROM malfunction	EE			Off 3s and blink 15 times	Off 1s and blink 11 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Replace outdoor control panel AP1
9	Limit/decrease frequency due to high temperature of module	EU		Off 3s and blink 6 times	Off 3s and blink 6 times				All loads operate normally, while operation frequency for compressor is decreased.	Discharging after the complete unit is de-energized for 20mins, check whether the thermal grease on IPM module of outdoor control panel AP1 is sufficient and whether the radiator is inserted tightly. If it is no use, please replace control panel AP1.
10	Malfunction protection of jumper cap	C5	Off 3s and blink 15 times						Indoor unit does not respond to the wireless remote commands.	No jumper cap inserted to main board; Jumper cap is inserted incorrectly; Jumper cap is damaged; Abnormal detecting circuit of main board;
11	Gathering refrigerant	F0	Off 3s and blink once	Off 3s and blink once		Off 1s and blink 17 times			When the outdoor unit receives the F0 signal, the system will be forced to run under cooling mode for gathering refrigerant.	Nominal cooling mode
12	Indoor ambient temperature sensor is open/short circuited	F1		Off 3s and blink once					During cooling and drying operation, indoor unit operates while other loads will stop. During heating operation the complete unit will stop operation.	Loosening or bad contact of indoor ambient temp. sensor and main board terminal; Components in main board fell down leading to short circuit; Indoor ambient temp. sensor damaged; Main board damaged;
13	Indoor evaporator temperature sensor is open/short circuited	F2		Off 3s and blink twice					AC stops operation once it reaches the set temperature. Cooling/drying: internal fan motor stops operation while other loads stop operation. Heating: AC stops operation.	Loosening or bad contact of indoor evaporator temp. sensor and main board terminal; Components in main board fell down leading to short circuit; Indoor evaporator temp. sensor damaged; Main board damaged;
14	Outdoor ambient temperature sensor is open/short circuited	F3		Off 3s and blink 3 times			Off 1s and blink 6 times		During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Outdoor temperature sensor hasn't been connected well or is damaged.
15	Outdoor condenser temperature sensor is open/short circuited	F4		Off 3s and blink 4 times			Off 1s and blink 5 times		During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Outdoor temperature sensor hasn't been connected well or is damaged.
16	Outdoor discharge temperature sensor is open/short circuited	F5		Off 3s and blink 5 times			Off 1s and blink 7 times		During cooling and drying operation, compressor will stop after operating for about 3 mins while indoor fan will operate. During heating operation, the complete unit will stop after operating for about 3 minutes.	Outdoor temperature sensor hasn't been connected well or is damaged; The head of temperature sensor hasn't been inserted in to the copper tube;
17	Limit/decrease frequency due to overload	F6		Off 3s and blink 6 times			Off 1s and blink 3 times		All loads operate normally, while operation frequency for compressor is decreased.	Please refer to the service manual
18	Decrease frequency due to overcurrent	F8		Off 3s and blink 8 times			Off 1s and blink once		All loads operate normally, while operation frequency for compressor is decreased.	The input supply voltage is too low; System pressure is too high and overload;
19	Decrease frequency due to high air discharge	F9		Off 3s and blink 9 times			Off 1s and blink twice		All loads operate normally, while operation frequency for compressor is decreased.	Overload or temperature is too high; Refrigerant is insufficient; Malfunction of electric expansion valve (EKV);
20	Limit/decrease frequency due to antifreezing	FH		Off 3s and blink twice	Off 3s and blink twice		Off 1s and blink 4 times		All loads operate normally, while operation frequency for compressor is decreased.	Poor air-return in indoor unit or fan speed is too low
21	Voltage for DC bus-bar is too high	PH		Off 3s and blink 11 times		Off 1s and blink 13 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Measure the voltage of position L and N on the wiring board (XT). If the voltage is higher than 265V AC, turn on the units after the supply voltage is increased to the normal range. If the AC input is normal, measure the voltage of electrolytic capacitor C on control panel (AP1), if it is normal, there's a malfunction on the circuit. Please replace the control panel (AP1).
22	Voltage of DC bus-bar is too low	PL			Off 3s and blink 21 times	Off 1s and blink 12 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Measure the voltage of position L and N on the wiring board (XT). If the voltage is higher than 150V AC, turn on the units after the supply voltage is increased to the normal range. If the AC input is normal, measure the voltage of electrolytic capacitor C on control panel (AP1), if it is normal, there's a malfunction on the circuit. Please replace the control panel (AP1).
23	Compressor min frequence in test state	P0		(during blinking ON 0.25s and OFF 0.25s)	(during blinking ON 0.25s and OFF 0.25s)					Shown during min. cooling or min. heating test
24	Compressor rated frequence in test state	P1		(during blinking ON 0.25s and OFF 0.25s)	(during blinking ON 0.25s and OFF 0.25s)					Shown during nominal cooling or nominal heating test
25	Compressor max frequence in test state	P2		(during blinking ON 0.25s and OFF 0.25s)	(during blinking ON 0.25s and OFF 0.25s)					Shown during max. cooling or max. heating test
26	Compressor intermediate frequence in test state	P3		(during blinking ON 0.25s and OFF 0.25s)	(during blinking ON 0.25s and OFF 0.25s)					Shown during middle cooling or middle heating test
27	Overcurrent protection of phase current for compressor	P5		Off 3s and blink 15 times					During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
28	Charging malfunction of capacitor	PU			Off 3s and blink 17 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
29	Malfunction of module temperature sensor circuit	P7			Off 3s and blink 18 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Replace outdoor control panel (AP1)
30	Module high temperature protection	P8			Off 3s and blink 19 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	After the complete unit id de-energized for 20mins, check whether the thermal grease on IPM module of outdoor control panel AP1 is sufficient and whether the radiator is inserted tightly. If it is no use, please replace control panel AP1.
31	Decrease frequency due to high temperature resistant during heating operation	H0			Off 3s and blink 10 times				All loads operate normally, while operation frequency for compressor is decreased.	Refer to the malfunction analysis (overload, high temperature resistant)
32	Static dedusting protection	H2			Off 3s and blink twice
33	Overload protection for compressor	H3			Off 3s and blink 3 times	Off 1s and blink 8 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Wiring terminal OVC-COMP is loosened. In normal state the resistance for this terminal should be less than 1ohm; Please refer to the service manual
34	System is abnormal	H4			Off 3s and blink 4 times	Off 1s and blink 6 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
35	IPM protection	H5			Off 3s and blink 5 times	Off 1s and blink 4 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
36	Module temperature is too high	H5			Off 3s and blink 5 times	Off 1s and blink 10 times
37	Internal motor (fan motor) does not operate	H6	Off 3s and blink 11 times						Internal fan motor, external fan motor, compressor and electric heater stop operation. Guid louver stops at present location.	Bad contact of DC motor feedback terminal; Bad contact of DC motor control end; Fan motor is stalling; Motor malfunction; Malfunction of main board rev detecting difficult;
38	Desynchronizing of compressor	H7			Off 3s and blink 7 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
39	PFC protection	HC			Off 3s and blink 6 times	Off 1s and blink 14 times			During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
40	Outdoor DC fan motor malfunction	L3	Off 3s and blink 23 times				Off 1s and blink 14 times		Outdoor DC fan motor malfunction lead to compressor stop operation	DC fan motor malfunction or system blocked or the connector loosened
41	Power protection	L9	Off 3s and blink 20 times			Off 1s and blink 9 times			Compressor stop operation and outdoor fan motor will stop 30s later, 3 minutes later the fan motor and compressor will restart.	To protect the electronic components when high power is detected
42	Indoor unit and outdoor unit doesn't match	LP	Off 3s and blink 19 times			Off 1s and blink 16 times			Compressor and outdoor fan motor won't work	Indoor unit and outdoor unit does not match
43	Failure start-up	LC			Off 3s and blink 11 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Please refer to the service manual
44	Malfunction of phase current detection circuit for compressor	U1			Off 3s and blink 13 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Replace outdoor control panel (AP1)
45	Malfunction of voltage dropping for DC bus-bar	U3			Off 3s and blink 20 times				During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Supply voltage is unstable
46	Malfunction of complete units current detection	U5		Off 3s and blink 13 times					During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	There is a circuit malfunction on the outdoor unit's control panel (AP1). Please replace the outdoor unit control panel (AP1).
47	The four-way valve is abnormal	U7		Off 3s and blink 20 times					If this malfunction occurs during heat operation, the complete unit will stop operation.	Supply voltage is lower than AC 175V; Wiring terminal 4V is loosened or broken; 4V is damaged, please replace 4V;
48	Zero-crossing malfunction of outdoor unit	U9	Off 3s and blink 18 times						During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating, all loads stop.	Replace outdoor control panel (AP1)
49	Frequency limiting (power)					Off 1s and blink 13 times
50	Compressor is open-circuited						Off 1s and blink once
51	The temperature for turning on the unit is reached						Off 1s and blink 8 times
52	Frequency limiting (module temperature)						Off 1s and blink 11 times
53	Normal communication							OFF 0.5s and blink once
54	Defrosting				Off 3s and blink once	Off 1s and blink twice			Defrosting will occur in heating mode. Compressor will operate while indoor fan will stop operation	It is in a normal state