Comfortmaker
Comfortmaker Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Indoor unit display shows E1 and cooling stops or runs briefly then shuts down
Indoor Room Temperature Sensor (Thermistor) Fault
E2
Indoor unit shows E2 and system stops cooling or runs with poor temperature control
Indoor Evaporator Coil Temperature Sensor Fault
E3
Comfortmaker indoor display shows E3 and outdoor unit does not start or shuts down quickly
Outdoor Coil Temperature Sensor Fault
E4
Indoor unit shows E4 and system stops or runs briefly then shuts down, often during heating or defrost on heat pump models
Discharge (Compressor) Temperature Sensor Fault
E5
Indoor unit displays E5 and outdoor unit does not start or shuts down; may occur at startup
Communication Fault Between Indoor and Outdoor Units
E6
Indoor unit shows E6 and compressor does not run or cycles off quickly
Compressor Overload / Current Protection Trip
E7
Indoor unit displays E7 and system will not run or only fan operates
Indoor Fan Motor Fault (ECM/BLDC Motor Error)
E8
Indoor unit shows E8 and system shuts down, often after running for a short time
High Pressure Protection / Overheat Protection
E9
Indoor unit displays E9 and unit may not respond to thermostat or remote commands
EEPROM / Control Board Memory Error
F0
Display shows F0 and unit will not start or stops shortly after starting
Refrigerant System Low Charge / Low Pressure Protection
F1
Display shows F1 and unit may run erratically or not at all
Indoor Ambient Sensor Out of Range (High/Low Temperature)
F2
Display shows F2 and unit may shut down during cooling
Evaporator Coil Freeze Protection / Low Coil Temperature
F3
Display shows F3 and outdoor unit may not start or may short-cycle
Outdoor Ambient Temperature Sensor Fault
F4
Display shows F4 and compressor operation is inhibited or erratic
Compressor Discharge Over-Temperature Protection
F5
Display shows F5 and unit may not defrost properly (heat pump models) or may shut down
Defrost Sensor / Coil Sensor Fault
F6
Display shows F6 and compressor speed or operation is limited (inverter models)
Inverter Module Overcurrent / Drive Fault
F7
Display shows F7 and unit may not respond to thermostat or remote
Communication Error with User Interface / Thermostat
F8
Display shows F8 and unit may shut down or limit capacity
Indoor Coil High Temperature / Overheat Protection
F9
Display shows F9 and system may not start or may shut down unexpectedly
Power Supply / Voltage Abnormality
Symptom
Comfortmaker air conditioner causes lights to dim or breaker to trip when starting
High Inrush Current / Electrical Overload
Symptom
Comfortmaker air conditioner emits a burning or electrical smell when running
Overheating Electrical Component or Dust Burn-Off
Symptom
Comfortmaker air conditioner frequently freezes the outdoor coil in heat pump heating mode
Defrost System Malfunction (Heat Pump)
Symptom
Comfortmaker air conditioner is very noisy outdoors; rattling, grinding, or squealing sounds
Mechanical Noise from Outdoor Unit
Symptom
Comfortmaker air conditioner runs but does not cool well; supply air only slightly cooler than room air
Poor Cooling Performance
Symptom
Comfortmaker air conditioner runs continuously and does not shut off even when set temperature is reached
Runaway Cooling / Thermostat or Control Stuck
Symptom
Comfortmaker air conditioner short cycles; turns on and off frequently without reaching set temperature
Short Cycling / Improper Capacity Control
Symptom
Comfortmaker indoor unit makes loud squealing or grinding noise when running
Indoor Blower Mechanical Failure
Symptom
Comfortmaker outdoor fan runs but compressor does not; no cooling
Compressor Not Starting
Symptom
Comfortmaker outdoor unit makes loud buzzing or humming but fan and compressor do not start
Failed Start/Run Capacitor or Locked Compressor
Symptom
Comfortmaker system cools some rooms but others remain warm; uneven cooling
Air Distribution / Ductwork Imbalance
Symptom
Comfortmaker system emits a musty or moldy odor when running
Biological Growth in Evaporator Coil or Drain Pan
Symptom
Comfortmaker system will not start at all; no indoor or outdoor operation
No Power / Control Circuit Failure
Symptom
Comfortmaker thermostat shows cooling call but outdoor unit does not receive 24V signal (no Y call at condenser)
Control Signal Interruption
Symptom
Ice forming on Comfortmaker indoor evaporator coil or suction line; reduced airflow and cooling
Evaporator Coil Icing
Symptom
Indoor blower runs but outdoor Comfortmaker condenser does not start; warm air from vents
Outdoor Unit Not Running
Symptom
Outdoor Comfortmaker condenser runs but indoor blower does not run; little or no air from vents
Indoor Blower Motor or Control Failure
Symptom
Water leaking from indoor Comfortmaker air handler or from ceiling near air handler
Condensate Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Indoor unit display shows E1 and cooling stops or runs briefly then shuts down
|
Indoor Room Temperature Sensor (Thermistor) Fault | View Details |
| E2 |
Indoor unit shows E2 and system stops cooling or runs with poor temperature control
|
Indoor Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Comfortmaker indoor display shows E3 and outdoor unit does not start or shuts down quickly
|
Outdoor Coil Temperature Sensor Fault | View Details |
| E4 |
Indoor unit shows E4 and system stops or runs briefly then shuts down, often during heating or defrost on heat pump models
|
Discharge (Compressor) Temperature Sensor Fault | View Details |
| E5 |
Indoor unit displays E5 and outdoor unit does not start or shuts down; may occur at startup
|
Communication Fault Between Indoor and Outdoor Units | View Details |
| E6 |
Indoor unit shows E6 and compressor does not run or cycles off quickly
|
Compressor Overload / Current Protection Trip | View Details |
| E7 |
Indoor unit displays E7 and system will not run or only fan operates
|
Indoor Fan Motor Fault (ECM/BLDC Motor Error) | View Details |
| E8 |
Indoor unit shows E8 and system shuts down, often after running for a short time
|
High Pressure Protection / Overheat Protection | View Details |
| E9 |
Indoor unit displays E9 and unit may not respond to thermostat or remote commands
|
EEPROM / Control Board Memory Error | View Details |
| F0 |
Display shows F0 and unit will not start or stops shortly after starting
|
Refrigerant System Low Charge / Low Pressure Protection | View Details |
| F1 |
Display shows F1 and unit may run erratically or not at all
|
Indoor Ambient Sensor Out of Range (High/Low Temperature) | View Details |
| F2 |
Display shows F2 and unit may shut down during cooling
|
Evaporator Coil Freeze Protection / Low Coil Temperature | View Details |
| F3 |
Display shows F3 and outdoor unit may not start or may short-cycle
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F4 |
Display shows F4 and compressor operation is inhibited or erratic
|
Compressor Discharge Over-Temperature Protection | View Details |
| F5 |
Display shows F5 and unit may not defrost properly (heat pump models) or may shut down
|
Defrost Sensor / Coil Sensor Fault | View Details |
| F6 |
Display shows F6 and compressor speed or operation is limited (inverter models)
|
Inverter Module Overcurrent / Drive Fault | View Details |
| F7 |
Display shows F7 and unit may not respond to thermostat or remote
|
Communication Error with User Interface / Thermostat | View Details |
| F8 |
Display shows F8 and unit may shut down or limit capacity
|
Indoor Coil High Temperature / Overheat Protection | View Details |
| F9 |
Display shows F9 and system may not start or may shut down unexpectedly
|
Power Supply / Voltage Abnormality | View Details |
| – |
Comfortmaker air conditioner causes lights to dim or breaker to trip when starting
|
High Inrush Current / Electrical Overload | View Details |
| – |
Comfortmaker air conditioner emits a burning or electrical smell when running
|
Overheating Electrical Component or Dust Burn-Off | View Details |
| – |
Comfortmaker air conditioner frequently freezes the outdoor coil in heat pump heating mode
|
Defrost System Malfunction (Heat Pump) | View Details |
| – |
Comfortmaker air conditioner is very noisy outdoors; rattling, grinding, or squealing sounds
|
Mechanical Noise from Outdoor Unit | View Details |
| – |
Comfortmaker air conditioner runs but does not cool well; supply air only slightly cooler than room air
|
Poor Cooling Performance | View Details |
| – |
Comfortmaker air conditioner runs continuously and does not shut off even when set temperature is reached
|
Runaway Cooling / Thermostat or Control Stuck | View Details |
| – |
Comfortmaker air conditioner short cycles; turns on and off frequently without reaching set temperature
|
Short Cycling / Improper Capacity Control | View Details |
| – |
Comfortmaker indoor unit makes loud squealing or grinding noise when running
|
Indoor Blower Mechanical Failure | View Details |
| – |
Comfortmaker outdoor fan runs but compressor does not; no cooling
|
Compressor Not Starting | View Details |
| – |
Comfortmaker outdoor unit makes loud buzzing or humming but fan and compressor do not start
|
Failed Start/Run Capacitor or Locked Compressor | View Details |
| – |
Comfortmaker system cools some rooms but others remain warm; uneven cooling
|
Air Distribution / Ductwork Imbalance | View Details |
| – |
Comfortmaker system emits a musty or moldy odor when running
|
Biological Growth in Evaporator Coil or Drain Pan | View Details |
| – |
Comfortmaker system will not start at all; no indoor or outdoor operation
|
No Power / Control Circuit Failure | View Details |
| – |
Comfortmaker thermostat shows cooling call but outdoor unit does not receive 24V signal (no Y call at condenser)
|
Control Signal Interruption | View Details |
| – |
Ice forming on Comfortmaker indoor evaporator coil or suction line; reduced airflow and cooling
|
Evaporator Coil Icing | View Details |
| – |
Indoor blower runs but outdoor Comfortmaker condenser does not start; warm air from vents
|
Outdoor Unit Not Running | View Details |
| – |
Outdoor Comfortmaker condenser runs but indoor blower does not run; little or no air from vents
|
Indoor Blower Motor or Control Failure | View Details |
| – |
Water leaking from indoor Comfortmaker air handler or from ceiling near air handler
|
Condensate Drainage Failure | View Details |
No matching codes found
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