Airwell
Airwell 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 stops and displays E1; cooling or heating stops shortly after startup.
Indoor Room Temperature Sensor (NTC) Fault
E2
Indoor unit shows E2 and stops; unit may start then shut down after a short time, especially in cooling mode.
Indoor Evaporator Coil Temperature Sensor Fault
E3
Indoor unit displays E3; unit may stop during heating or defrost cycles.
Indoor Coil Frost/Defrost Sensor Fault
E4
Indoor unit shows E4 and stops; may occur shortly after compressor starts, often in cooling mode.
Indoor Fan Motor or Fan Feedback Fault
E5
Indoor unit displays E5; compressor does not start or stops quickly; outdoor unit may not run.
Communication Fault Between Indoor and Outdoor Units
E6
Indoor unit shows E6; compressor may not start or may shut down; sometimes accompanied by outdoor unit not responding.
Outdoor Unit Communication or Feedback Fault
E7
Indoor unit displays E7; outdoor fan does not run or runs erratically; system may overheat and shut down.
Outdoor Fan Motor Fault
E8
Indoor unit shows E8; unit may stop and not respond to remote; sometimes associated with power supply issues.
Indoor PCB Power Supply or EEPROM Fault
E9
Indoor unit displays E9; unit may stop and flash lights; sometimes associated with indoor coil or drain issues.
Indoor Unit Protection / Sensor Combination Fault
F1
Indoor unit displays F1; unit may run briefly then stop; often related to outdoor coil temperature sensing.
Outdoor Coil Temperature Sensor Fault
F2
Indoor unit shows F2; system may shut down in heating mode or not start heating.
Outdoor Ambient Temperature Sensor Fault
F3
Indoor unit displays F3; compressor may not start or may shut down quickly; often associated with discharge temperature issues.
Compressor Discharge Temperature Sensor Fault
F4
Indoor unit shows F4; compressor may not start; sometimes accompanied by outdoor fan running without cooling.
Compressor Overload or Inverter Module Protection
F5
Indoor unit displays F5; system may shut down during heating or cooling; sometimes linked to low or high pressure protection.
Refrigerant System Protection (Pressure / Temperature Related)
F6
Indoor unit shows F6; unit may stop in heating mode; often related to defrost or outdoor coil temperature.
Outdoor Defrost Sensor or Defrost Protection Fault
F7
Indoor unit displays F7; unit may not respond correctly to remote commands or may operate erratically.
Indoor Display Board / Communication Fault
F8
Indoor unit shows F8; unit may stop and not restart; sometimes associated with power factor or current sensing.
Current Sensor or Overcurrent Detection Fault
F9
Indoor unit displays F9; system may not start or may shut down unexpectedly.
EEPROM / Configuration Data Error
H1
Indoor unit displays H1; unit may run in a special mode with reduced airflow; often appears in heating mode.
Defrost Operation Indicator / Protection Mode
H2
Indoor unit shows H2; heating stops or is very weak; unit may frequently enter defrost.
Over-defrost or Defrost Protection Fault
H3
Indoor unit displays H3; compressor stops; unit may not restart until cooled.
Compressor Overheat Protection
H4
Indoor unit shows H4; unit may not start or may shut down quickly; often indicates a protection lockout.
System Lockout / Multiple Protection Triggered
H5
Indoor unit displays H5; unit may not start; often related to IPM (inverter module) protection.
Inverter IPM Protection / Overcurrent
H6
Indoor unit shows H6; indoor fan may not run or runs erratically.
Indoor Fan Motor Hall Sensor / Feedback Fault
H7
Indoor unit displays H7; outdoor fan may not run correctly; system may overheat.
Outdoor Fan Motor Feedback Fault
H8
Indoor unit shows H8; unit may stop; sometimes associated with low-pressure or refrigerant issues.
Low Pressure Protection / Refrigerant Undercharge
H9
Indoor unit displays H9; unit may not heat properly; often related to indoor coil temperature in heating mode.
Indoor Coil Temperature Abnormal in Heating
P0
Indoor unit displays P0; unit may not start or may shut down; often indicates DC bus voltage or power issue.
DC Bus Voltage Protection
P1
Indoor unit shows P1; unit may run at reduced capacity or shut down; often related to voltage or phase issues.
Input Voltage Protection
P2
Indoor unit displays P2; unit may stop; often associated with high temperature or overload.
Overload / Overtemperature Protection
P3
Indoor unit shows P3; unit may not start or may run intermittently; often related to outdoor ambient or coil temperature limits.
Outdoor Temperature Limit Protection
P4
Indoor unit displays P4; unit may stop; often associated with indoor coil temperature limits.
Indoor Coil Overheat / Freeze Protection
Symptom
Burning, electrical, or plastic smell from indoor or outdoor unit during operation.
Overheating Electrical Component or Insulation
Symptom
Excessive vibration or rattling of the outdoor unit, transmitted into the building structure.
Outdoor Unit Vibration / Mounting Issue
Symptom
Indoor unit and remote appear normal but the system will not start (no fan, no compressor).
No-Start Condition / Control Power or Signal Fault
Symptom
Indoor unit blows air but does not cool; room temperature does not drop even after long operation.
Loss of Cooling Capacity / Refrigerant Undercharge
Symptom
Indoor unit displays correct temperature but actual room temperature is much higher or lower.
Temperature Sensing / Calibration Error
Symptom
Indoor unit frequently turns on and off (short cycling) without reaching the set temperature.
Short Cycling / Control or Sizing Issue
Symptom
Indoor unit leaks water from the front panel or drips onto the wall/floor during cooling.
Clogged or Misaligned Condensate Drain System
Symptom
Loud humming, buzzing, or knocking noise from the outdoor unit during operation.
Outdoor Mechanical Noise / Compressor or Fan Issue
Symptom
Loud rattling, buzzing, or grinding noise from the indoor unit during operation.
Indoor Mechanical Noise / Blower Imbalance
Symptom
Outdoor unit runs but indoor fan does not blow air, or airflow is extremely weak.
Indoor Fan Motor or Blower Obstruction
Symptom
Remote control does not operate the indoor unit, but the unit can be controlled by buttons on the panel (if present).
IR Receiver or Remote Communication Failure
Symptom
Strong musty or moldy smell from the indoor unit when it starts.
Biological Growth on Evaporator Coil and Drain Pan
Symptom
Unit trips the circuit breaker immediately or shortly after starting.
Electrical Short or Overcurrent
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Indoor unit stops and displays E1; cooling or heating stops shortly after startup.
|
Indoor Room Temperature Sensor (NTC) Fault | View Details |
| E2 |
Indoor unit shows E2 and stops; unit may start then shut down after a short time, especially in cooling mode.
|
Indoor Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Indoor unit displays E3; unit may stop during heating or defrost cycles.
|
Indoor Coil Frost/Defrost Sensor Fault | View Details |
| E4 |
Indoor unit shows E4 and stops; may occur shortly after compressor starts, often in cooling mode.
|
Indoor Fan Motor or Fan Feedback Fault | View Details |
| E5 |
Indoor unit displays E5; compressor does not start or stops quickly; outdoor unit may not run.
|
Communication Fault Between Indoor and Outdoor Units | View Details |
| E6 |
Indoor unit shows E6; compressor may not start or may shut down; sometimes accompanied by outdoor unit not responding.
|
Outdoor Unit Communication or Feedback Fault | View Details |
| E7 |
Indoor unit displays E7; outdoor fan does not run or runs erratically; system may overheat and shut down.
|
Outdoor Fan Motor Fault | View Details |
| E8 |
Indoor unit shows E8; unit may stop and not respond to remote; sometimes associated with power supply issues.
|
Indoor PCB Power Supply or EEPROM Fault | View Details |
| E9 |
Indoor unit displays E9; unit may stop and flash lights; sometimes associated with indoor coil or drain issues.
|
Indoor Unit Protection / Sensor Combination Fault | View Details |
| F1 |
Indoor unit displays F1; unit may run briefly then stop; often related to outdoor coil temperature sensing.
|
Outdoor Coil Temperature Sensor Fault | View Details |
| F2 |
Indoor unit shows F2; system may shut down in heating mode or not start heating.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F3 |
Indoor unit displays F3; compressor may not start or may shut down quickly; often associated with discharge temperature issues.
|
Compressor Discharge Temperature Sensor Fault | View Details |
| F4 |
Indoor unit shows F4; compressor may not start; sometimes accompanied by outdoor fan running without cooling.
|
Compressor Overload or Inverter Module Protection | View Details |
| F5 |
Indoor unit displays F5; system may shut down during heating or cooling; sometimes linked to low or high pressure protection.
|
Refrigerant System Protection (Pressure / Temperature Related) | View Details |
| F6 |
Indoor unit shows F6; unit may stop in heating mode; often related to defrost or outdoor coil temperature.
|
Outdoor Defrost Sensor or Defrost Protection Fault | View Details |
| F7 |
Indoor unit displays F7; unit may not respond correctly to remote commands or may operate erratically.
|
Indoor Display Board / Communication Fault | View Details |
| F8 |
Indoor unit shows F8; unit may stop and not restart; sometimes associated with power factor or current sensing.
|
Current Sensor or Overcurrent Detection Fault | View Details |
| F9 |
Indoor unit displays F9; system may not start or may shut down unexpectedly.
|
EEPROM / Configuration Data Error | View Details |
| H1 |
Indoor unit displays H1; unit may run in a special mode with reduced airflow; often appears in heating mode.
|
Defrost Operation Indicator / Protection Mode | View Details |
| H2 |
Indoor unit shows H2; heating stops or is very weak; unit may frequently enter defrost.
|
Over-defrost or Defrost Protection Fault | View Details |
| H3 |
Indoor unit displays H3; compressor stops; unit may not restart until cooled.
|
Compressor Overheat Protection | View Details |
| H4 |
Indoor unit shows H4; unit may not start or may shut down quickly; often indicates a protection lockout.
|
System Lockout / Multiple Protection Triggered | View Details |
| H5 |
Indoor unit displays H5; unit may not start; often related to IPM (inverter module) protection.
|
Inverter IPM Protection / Overcurrent | View Details |
| H6 |
Indoor unit shows H6; indoor fan may not run or runs erratically.
|
Indoor Fan Motor Hall Sensor / Feedback Fault | View Details |
| H7 |
Indoor unit displays H7; outdoor fan may not run correctly; system may overheat.
|
Outdoor Fan Motor Feedback Fault | View Details |
| H8 |
Indoor unit shows H8; unit may stop; sometimes associated with low-pressure or refrigerant issues.
|
Low Pressure Protection / Refrigerant Undercharge | View Details |
| H9 |
Indoor unit displays H9; unit may not heat properly; often related to indoor coil temperature in heating mode.
|
Indoor Coil Temperature Abnormal in Heating | View Details |
| P0 |
Indoor unit displays P0; unit may not start or may shut down; often indicates DC bus voltage or power issue.
|
DC Bus Voltage Protection | View Details |
| P1 |
Indoor unit shows P1; unit may run at reduced capacity or shut down; often related to voltage or phase issues.
|
Input Voltage Protection | View Details |
| P2 |
Indoor unit displays P2; unit may stop; often associated with high temperature or overload.
|
Overload / Overtemperature Protection | View Details |
| P3 |
Indoor unit shows P3; unit may not start or may run intermittently; often related to outdoor ambient or coil temperature limits.
|
Outdoor Temperature Limit Protection | View Details |
| P4 |
Indoor unit displays P4; unit may stop; often associated with indoor coil temperature limits.
|
Indoor Coil Overheat / Freeze Protection | View Details |
| – |
Burning, electrical, or plastic smell from indoor or outdoor unit during operation.
|
Overheating Electrical Component or Insulation | View Details |
| – |
Excessive vibration or rattling of the outdoor unit, transmitted into the building structure.
|
Outdoor Unit Vibration / Mounting Issue | View Details |
| – |
Indoor unit and remote appear normal but the system will not start (no fan, no compressor).
|
No-Start Condition / Control Power or Signal Fault | View Details |
| – |
Indoor unit blows air but does not cool; room temperature does not drop even after long operation.
|
Loss of Cooling Capacity / Refrigerant Undercharge | View Details |
| – |
Indoor unit displays correct temperature but actual room temperature is much higher or lower.
|
Temperature Sensing / Calibration Error | View Details |
| – |
Indoor unit frequently turns on and off (short cycling) without reaching the set temperature.
|
Short Cycling / Control or Sizing Issue | View Details |
| – |
Indoor unit leaks water from the front panel or drips onto the wall/floor during cooling.
|
Clogged or Misaligned Condensate Drain System | View Details |
| – |
Loud humming, buzzing, or knocking noise from the outdoor unit during operation.
|
Outdoor Mechanical Noise / Compressor or Fan Issue | View Details |
| – |
Loud rattling, buzzing, or grinding noise from the indoor unit during operation.
|
Indoor Mechanical Noise / Blower Imbalance | View Details |
| – |
Outdoor unit runs but indoor fan does not blow air, or airflow is extremely weak.
|
Indoor Fan Motor or Blower Obstruction | View Details |
| – |
Remote control does not operate the indoor unit, but the unit can be controlled by buttons on the panel (if present).
|
IR Receiver or Remote Communication Failure | View Details |
| – |
Strong musty or moldy smell from the indoor unit when it starts.
|
Biological Growth on Evaporator Coil and Drain Pan | View Details |
| – |
Unit trips the circuit breaker immediately or shortly after starting.
|
Electrical Short or Overcurrent | View Details |
No matching codes found
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