Blue Series 2 Indoor Unit Troubleshooting

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Note: ★ - Solid light, ○ - Flashing light, x - Light is off

Error Code Indoor PCB LED lights Error Description Troubleshooting
Running Timer Sleep Power
1 2 3 4
EA Display Board and Control Board Communication Error
  • The connection between the display board and control board might be loose.
  • The indoor control board might have failed.
  • The wiring of the display board might be incorrect.
0 Normal Operations
1 x ○ x x Outdoor Coil Temperature Sensor Failure
  • The outdoor coil temperature sensor might be loose.
  • The outdoor coil temperature sensor might have failed.
  • The indoor control board might have failed.
2 x ○ ★ x Compressor Exhaust Temperature Sensor Failure
  • The compressor exhaust temperature sensor might be loose.
  • The compressor exhaust temperature sensor might have failed.
  • The outdoor control board might have failed.
5 ★ ○ x x IPM Module Protection
  • The IPM board might have failed.
  • The outdoor fan might be broken.
  • The outdoor fan motor might have failed.
  • The outdoor fan is being obstructed.
  • The condenser might be dirty.
  • The outdoor unit might not have been installed correctly.
6 ★ ○ x ★ AC Voltage Higher or Lower Protection
  • The supply voltage is higher or lower than normal.
  • The inner supply voltage of the unit is higher or lower than normal.
7 ★ ○ ★ x Communication Failure Between Indoor and Outdoor Units
  • The communication cable connection might be loose.
  • The communication cable might have failed.
  • The connection between the filter board and the outdoor control board might be incorrect or loose.
  • The connection between the filter board and the terminal might be incorrect or loose.
  • The indoor unit control board might have failed.
  • The PFC board might have failed.
  • The power board might have failed.
  • The outdoor unit control board might have failed.
8 ★ ○ ★ ★ Current Overload Protection
  • The fan motor might have run abnormally.
  • The condenser and/or evaporator might be dirty.
  • The air inlet and outlet might be abnormal.
9 x x ○ x Maximum Current Protection
  • The outdoor control board might have short-circuited.
  • The drive board might have short-circuited.
  • Other electrical components might have short-circuited.
10 x x ○ ★ Communication Error Between Outdoor Unit Control Board and Driver Board
  • The connection between control board and driver board might be loose.
  • Either the control or driver board might have failed.
11 x ★ ○ x Check Outdoor EEPROM
  • The EEPROM chip might be loose.
  • The EEPROM chip might be inserted improperly.
  • The EEPROM chip might have failed.
12 x ★ ○ ★ Outdoor Ambient Temperature Too Low Protection
  • Outdoor ambient temperature too low for operation.
13 ★ x ○ x Compressor Exhaust Temperature Too High Protection
  • The compressor exhaust temperature sensor might have failed.
  • The unit has insufficient refrigerant.
14 ★ x ○ ★ Check Outdoor Ambient Temperature Sensor
  • The outdoor ambient temperature sensor's connection might be loose.
  • The outdoor ambient temperature sensor might have failed.
  • The outdoor control board might have failed.
15 ★ ★ ○ x Compressor Shell Temperature Too High Protection
  • The compressor exhaust temperature sensor might be loose.
  • The unit has insufficient refrigerant.
16 Anti-Freeze Protection (Cooling) or Overload Protection (Heating) in Indoor Unit
  • The indoor coil temperature sensor might be loose.
  • The indoor coil temperature sensor might have failed.
  • The indoor control board might have failed.
  • The refrigerant system is abnormal.
17 PFC Protection
  • The PFC might have failed.
  • The outdoor drive board might have failed.
18 DC Compressor Start Failure
  • The outdoor drive board might have failed.
  • The compressor might have failed.
19 x x x ○ Check Compressor Drive
  • The outdoor drive board might have failed.
  • The compressor might have failed.
  • The outdoor control board might have failed.
20 ★ x x ○ Outdoor Fan Motor Locked Rotor Protection
  • The connection of the outdoor fan motor might be loose.
  • There might be something obstructing the outdoor fan motor.
  • The fan motor might have failed.
  • The outdoor control board might have failed.
21 Outdoor Coil Anti-Overload Protection With Cooling
  • There might be too much refrigerant.
  • The outdoor fan motor might have failed.
  • The outdoor fan might be broken.
  • The condensor might be dirty.
  • The air inlet and outlet of the indoor and outdoor unit is abnormal.
22 Compressor Pre-Heating Process
  • This is a normal operation mode in cold weather.
24 Check Outdoor Board Chip
  • The drive board might not be compatible with this unit.
  • The compressor might not be compatible with this unit.
25 Low Frequency Protection
  • When frequency of system is too low, the unit will start self protection, and when working condition comes back, the unit will work again. Usually, after about 3 to 5 mins, the unit will recover or you can power off unit at first, then restart the unit.
26 Protection Against Overheated Outdoor Radiator
  • Radiator sensors might have failed.
  • Detection circuit of the sensor on the control panel might have failed.
27 High Pressure System Protection
  • The pressure switch might have failed.
  • The pressure detection system on the control panel might have failed.
  • The measured value of the system pressure might have exceeded the limit.
33 ○ x x ★ Check Indoor Ambient Temperature Sensor
  • The indoor ambient temperature sensor might be loose.
  • The indoor ambient temperature sensor might have failed.
  • The indoor ambient control board might have failed.
34 ○ x ★ x Check indoor Coil Temperature Sensor
  • The indoor coil temperature sensor might be loose.
  • The indoor coil temperature sensor might have failed.
  • The indoor control board might have failed.
36 ○ ★ x ★ Communication Failure Between Indoor and Outdoor Unit
  • The communication cable connection might be loose.
  • The communication cable might have failed.
  • The connection between the filter board and the outdoor control board might be incorrect or loose.
  • The connection between the filter board and the terminal might be incorrect or loose.
  • The indoor unit control board might have failed.
  • The PFC board might have failed.
  • The power board might have failed.
  • The outdoor unit control board might have failed.
38 ○ ★ ★ ★ Check Indoor EEPROM Failure
  • The EEPROM chip might be loose.
  • The indoor control board might have failed.
39 ○ x ★ ★ Check Indoor Fan Motor
  • The indoor fan motor might be obstructed.
  • The indoor fan motor cord might be loose.
  • The indoor fan motor might have failed.
  • The indoor control board might have failed.
41 ★ ★ ○ ★ Indoor Board Grounding Failure
  • Indoor control board has failed.
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