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.
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