Comfort Aire AC Error Codes

Some issues can be resolved without any maintenance to the unit, check the chart below to see if there is a suggested solution to the problem before calling for service.

Comfortaire AC Error Codes and Troubleshooting
Comfortaire AC Error Codes and Troubleshooting


Glossary of Error Codes and Their Meanings:

Error CodesMeaning
E1High Pressure Protection
E2Shutdown for Whole Unit AntiFreeze Protection
E3Low Pressure Protection
E4High Discharge Temp Protection
E6Communication Error
E9Indoor Unit Water Full Error
FoRefrigerant Recovery Mode
F3Outdoor Ambient Temp Sensor Error
F4Outdoor Mid-Coil Temp Sensor Error
F5Outdoor Discharge Air Temp Sensor Error
F7Oil Return for Cooling
H1Forced Defrosting
H2Oil Return for Heating or Defrosting
H3Compressor Overheat Protection
H5IPM Protection
H7Motor Desynchronizing
HcPFC Error
LcStartup Failure
LADC Fan motor Error
LdPhase Loss
LECompressor Stalling
P0IPM Reset
P5Compressor Current Protection
P6Communication Error between the Inverter Drive and the Main Controller
P7Radiator Temp Sensor Error
P8Radiator Overheat Protection
P9AC Contactor Protection
PcCurrent Sensor Error
PdSensor Connection Protection
PHOver Voltage Protection
PLLow Voltage Protection
PETemp Drift Protection
PFDrive Board Ambient Temp Sensor Error
PAAC Current Protection
PUCharging Circuit Error
PPAC Input Voltage Anomaly


Before calling for service, review this list. It may save you time and expense. This list includes common occurrences that are not the result of defective workman-ship or materials in this appliance.

Problem: The unit will not operate at all.


  1. Blown Fuse or tripped circuit breaker
  2. Power Failure
  3. Remote Control batteries are low
  4. Signal from remote control is not being sent


  1. Check the fuse or circuit breaker. Replace the blown fuse or reset the circuit breaker.
  2. Wait until the power is restored to restart the unit. If you experience brown out conditions, contact an electrician or your local utility.
  3. Replace the batteries. Be sure not to mix old and new batteries, as well as different brands/types
  4. Be sure that you are not using the remote control too far away from the indoor unit’s control panel.

Problem: The unit runs and then stops immediately

Cause: Air inlets and/or outlets are blocked

Solution: Remove any obstacles from the air inlets/outlets/Clean the air filter, louvers, and inlet grille.

Problem: Abnormal heating or cooling


  1. Air inlets and/or outlets are blocked
  2. Improper temperature is set
  3. Check the fan speed
  4. Improper louver adjustment
  5. Be sure that there are no other sources of heat/steam in the area being cooled
  6. Conditioned air might be escaping


  1. Remove any obstacles from the air inlets/outlets-Clean the air filter, louvers, and inlet grille.
  2. Ensure that the proper mode and temperature is set on the unit. Try to adjust the set point temperature on the thermostat to a better operating temperature
  3. Adjust the fan speed to see if that improves the conditions.
  4. Try to adjust the louver position to ensure it is open enough.
  5. Remove or turn off other appliances producing heat or steam.
  6. Ensure that any doors or windows in the area being heated/cooled are closed

Problem: Air from unit does not feel cold enough


  1. Room temperature below 62 F(17 C ). Cooling may not occur until room temperature O O rises above 62 F(17 C).
  2. Temperature sensing behind air filter element touching cold coil. Keep it from the cold coil.
  3. Set to a Lower temperature.
  4. Compressor stopped when changing modes. Wait for 3 minutes after set to the COOL mode.

Problem: Noise when unit is cooling


  1. Air movement sound. This is normal . If too loud, set to a slower FAN setting.
  2. Window vibration – poor installation. Refer to installation instructions or check with installer.
Comfort Aire Mini Split Ductless Air Conditioners Error Codes
Comfort Aire Mini Split Ductless Air Conditioners Error Codes


After power on, LED3 (Green color) and LED2 (Red color) will be flash if the unit has some
After power on, LED3 (Green color) and LED2 (Red color) will be flash if the unit has some

COMFORT-AIRE BG-81P Owner’s Manual PDF


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