Blue Series 2 Outdoor Unit Troubleshooting

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Note: ★ - Solid light, ○ - Flashing light, ` - Light is off x - Light Flashes every two seconds

Error Code Outdoor PCB LED lights Error Description Troubleshooting
LED1 LED2 LED3
` ` ` Normal Operation
` Check Outdoor Coil Temperature Sensor
  • The outdoor coil temperature sensor might be loose.
  • The outdoor coil temperature sensor might have failed.
  • The outdoor unit's main control board might have failed.
` ` Check Compressor Exhaust Temperature Sensor
  • The compressor exhaust temperature sensor might be loose.
  • The compressor exhaust temperature sensor might have failed.
  • The outdoor unit's main control board might have failed.
` ` 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.
` 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.
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.
` 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.
Check Outdoor EEPROM
  • The EEPROM chip might be loose.
  • The EEPROM chip might be inserted improperly.
  • The EEPROM chip might have failed.
` Compressor Exhaust Temperature Too High Protection
  • The compressor exhaust temperature sensor might have failed.
  • The unit has insufficient refrigerant.
` 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.
` Compressor Shell Temperature Too High Protection
  • The compressor exhaust temperature sensor might be loose.
  • The unit has insufficient refrigerant.
` 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.
` Check Compressor Drive
  • The outdoor drive board might have failed.
  • The compressor might have failed.
  • The outdoor control board might have failed.
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.
` ` 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.
` ` 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 might be obstructed.
  • The condenser might be dirty.
  • The outdoor unit might have been installed incorrectly.
` ` PFC Protection
  • The PFC might have failed.
  • The outdoor drive board might have failed.
Compressor Pre-Heating Process
  • This is a normal operation mode in cold weather.
` Check Outdoor Board Chip
  • The drive board might not be compatible with this unit.
  • The compressor might not be compatible with this unit.
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.
` DC Compressor Start Failure
  • The outdoor drive board might have failed.
  • The compressor might have failed.
Outdoor Ambient Temperature Too Low Protection
  • Outdoor ambient temperature too low for operation.
x x Protection Against Overheated Outdoor Radiator
  • Radiator sensors might have failed.
  • Detection circuit of the sensor on the control panel might have failed.
x 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.