Comfort Aire AC Error Codes – Problems And Their Meaning (With Fixes)

Comfort-Aire brand came into being in 1955 and has since then been the benchmark for quality and innovation. With headquarters in Jackson, Michigan the company has created a legacy that is hard to match. It was one of the few corporations in the US that become a household brand in the 1095s offering customers the best there was to offer.

Today Comfort-Aire is regarded as one of the best producers of cooling, heating, and dehumidification products. Owned by MARS the company has still been able to stand out from the crowd while taking complete advantage of its parent companies’ access. MARS is currently the leading supplier of HVACR components and motors and even acquired a heat controller in 2013.

Error codes are a common issue you may face with various appliances in your house or workplace. Rather than panicking, we suggest you grab a pen and paper and note down the code rather than pressing various buttons. This can commonly result in prolonging the issue or even causing more issues in the long run. So why risk damaging your appliance any further, when you will be able to find out the exact issue using the common error code list for comfort Aire ac error codes listed below. Once you know the exact issue you can easily call in a professional, or fix the issue yourself.

Glossary of Error Codes and Their Meanings

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.

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

Danny Reese

*If you can't find the code you're looking for on our site, please let us know, and we'll update our database as soon as possible.

35 thoughts on “Comfort Aire AC Error Codes – Problems And Their Meaning (With Fixes)”

  1. My Comfort aire heat pump has a F0 error code and it looks like system charge shortage or blockage protection or Refrigerate recovery mode…it’s not even a year old and I got it from the weatherization program. Wonder which issue it is and is this expensive or warrantied ya think?

    • Hi Paula, thanks for your comment.

      If it is under warranty, the cost of repairs or replacement should be covered.

      They will have the necessary equipment and expertise to identify the root cause of the error code and provide you with an estimate for repairs or replacement.

  2. I need to know what this code means cause it’s not in the book/ manual that came with it Lo or L0 I’m not sure if it’s a zero or letter O my company bought 120 unit an all of them say that code and that plastic fan I guess the cooling fan are all rotting breaking these things are a year-and-a-half-old and I got one that has a bad compressor and I think we’ve replaced at least 20 of them and it’s really hard to find them because they’re being up saluted

  3. What does df mean? I get it frequently. Today it is snowing, blowing and cold. It shuts off almost every hour or less and has df on the panel. I cant find explanation for that code. I turn it off and turn it back on and it works until next time.

  4. What’s an E7 Running Mode Conflict? I cleaned the filters. One unit works, the other does nothing and displays E7. That’s not in my Operation Manual.

  5. Mine won’t stay on. I unplug it and plug it back in and it comes on but shuts off after a few seconds…no error code, all the lights flash once and then it cycles once through the numbers 22, 44, 77, 88 and then goes blank

    • EC code: Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 <Tcool-2°C (Tcool-35.6°F) does not remain continuous 4 seconds and this situation happens 3 times, the display area will show “EC” and AC will turn off. Possible causes: T2 sensor faulty. Indoor PCB faulty. System problems, such as leakage or blocking.

  6. My compressor will not come at all. For cool or heat.
    We get an error code outside p7 and inside p4
    What is wrong


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