Blue Series Troubleshooting (9K & 12K)

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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;
3 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
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