View source for Blue Series 3 Indoor Unit Troubleshooting

'''Note: ★ - Solid light, ○ - Flashing light, x - Light is off'''
{| class="wikitable"
| rowspan="3"| Error Code
| colspan="4"| Indoor PCB LED lights
| rowspan="3"| Error Description
| rowspan="3"| 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.
|-