Carrier 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 displays E1 and cooling stops intermittently.
Indoor/Outdoor Communication Fault
E2
Indoor unit shows E2 and the evaporator coil ices up or the unit stops cooling.
Evaporator Coil Temperature Sensor (T1) Fault
E3
Indoor unit displays E3 and the outdoor unit does not run or stops shortly after starting.
Outdoor Unit Protection / High-Pressure or Overload Trip
E4
Indoor unit shows E4 and cooling performance is poor or the unit stops after a short run.
Evaporator Coil Freeze Protection / Low-Temperature Lockout
E5
Indoor unit displays E5 and the outdoor unit does not start or shuts down quickly.
Overcurrent / Compressor Overload Protection
E6
Indoor unit shows E6 and the system does not respond to cooling commands.
Indoor Fan Motor Fault / Feedback Error
E7
Indoor unit displays E7 and the outdoor unit does not operate.
Mode Conflict / Indoor-Outdoor Mismatch or Reversing Valve Error
E8
Indoor unit shows E8 and the unit stops with strong airflow or unusual noise.
Indoor Fan Overload / Over-speed Protection
E9
Indoor unit displays E9 and may leak water or shut down unexpectedly.
Full Drain Pan / Water Level Sensor Fault
F0
Indoor unit shows F0 and the system does not cool properly.
Refrigerant Undercharge / Low Refrigerant Protection
F1
Indoor unit displays F1 and runs erratically or not at all.
Indoor Ambient Temperature Sensor (Room Thermistor) Fault
F2
Indoor unit shows F2 and the unit may short cycle or not reach the set temperature.
Evaporator Pipe Temperature Sensor (T3) Fault
F3
Indoor unit displays F3 and the outdoor unit may not operate correctly in heating mode.
Outdoor Ambient Temperature Sensor Fault
F4
Indoor unit shows F4 and heating or cooling capacity is unstable.
Outdoor Coil Temperature Sensor Fault
F5
Indoor unit displays F5 and the system may shut down in heating mode.
Defrost Sensor / Outdoor Coil Low-Temperature Fault
F6
Indoor unit shows F6 and the outdoor fan may not operate correctly.
Outdoor Fan Motor Fault
F7
Indoor unit displays F7 and the system may not start or may shut down unexpectedly.
Outdoor EEPROM / PCB Memory Fault
F8
Indoor unit shows F8 and the unit may not respond to the remote or may operate erratically.
Indoor EEPROM / PCB Memory Fault
F9
Indoor unit displays F9, and the louver may not move correctly.
Indoor Louver Stepper Motor Fault
P0
Indoor unit displays P0, and the system will not start or stops shortly after starting.
Inverter Module / IPM Protection
P1
Indoor unit displays P1, and the system may not run or may shut down under load.
High/Low Voltage Protection
P2
Indoor unit displays P2, and the outdoor unit stops, especially in high ambient temperatures.
Compressor Overheating / High Discharge Temperature Protection
P3
Indoor unit displays P3, and the system may not start in heating mode or may shut down.
Low Outdoor Ambient Protection / Compressor Low-Temperature Protection
P4
Indoor unit displays P4, and the system may not run or may shut down under heavy load.
Inverter Module Overheating / IPM Temperature Protection
P5
Indoor unit displays P5, and the system may not operate in heating mode.
Defrost Protection / Outdoor Coil Over-icing
Symptom
Carrier air conditioner blows warm air in cooling mode
Loss of Cooling / Reversing Valve or Refrigerant Issue
Symptom
Carrier air conditioner cycles between heating and cooling unexpectedly (heat pump models).
Reversing Valve or Control Logic Fault
Symptom
Carrier air conditioner emits a burning or electrical smell.
Overheating Electrical Component
Symptom
Carrier air conditioner emits a musty or moldy smell when starting.
Biological Growth on Evaporator Coil and Drain Pan
Symptom
Carrier air conditioner frequently trips the circuit breaker.
Overcurrent / Electrical Overload
Symptom
Carrier air conditioner indoor unit display is blank, but the unit still runs with the remote.
Display Board Failure
Symptom
Carrier air conditioner indoor unit freezes up with ice on the coil.
Evaporator Coil Icing
Symptom
Carrier air conditioner indoor unit louvers do not move or are stuck in one position.
Louver Mechanism Jam
Symptom
Carrier air conditioner indoor unit runs, but the outdoor unit does not start.
Outdoor Unit Non-Start
Symptom
Carrier air conditioner makes loud rattling or buzzing noises during operation.
Mechanical Vibration / Loose Components
Symptom
Carrier air conditioner remote control does not operate the indoor unit.
Remote Control / IR Receiver Failure
Symptom
Carrier air conditioner runs but does not cool the room effectively.
Insufficient Cooling Capacity / Performance Degradation
Symptom
Carrier air conditioner turns ON but shuts OFF after a few minutes.
Short Cycling
Symptom
Carrier air conditioner will not turn ON at all (no lights, no response).
No Power / Control Circuit Dead
Symptom
Carrier outdoor unit is very loud or vibrates excessively.
Outdoor Unit Vibration / Mounting Issue
Symptom
Carrier outdoor unit runs, but the indoor fan does not blow air.
Indoor Blower Failure
Symptom
Water leaking from the indoor Carrier air conditioner onto the wall or floor.
Condensate Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Indoor unit displays E1 and cooling stops intermittently.
|
Indoor/Outdoor Communication Fault | View Details |
| E2 |
Indoor unit shows E2 and the evaporator coil ices up or the unit stops cooling.
|
Evaporator Coil Temperature Sensor (T1) Fault | View Details |
| E3 |
Indoor unit displays E3 and the outdoor unit does not run or stops shortly after starting.
|
Outdoor Unit Protection / High-Pressure or Overload Trip | View Details |
| E4 |
Indoor unit shows E4 and cooling performance is poor or the unit stops after a short run.
|
Evaporator Coil Freeze Protection / Low-Temperature Lockout | View Details |
| E5 |
Indoor unit displays E5 and the outdoor unit does not start or shuts down quickly.
|
Overcurrent / Compressor Overload Protection | View Details |
| E6 |
Indoor unit shows E6 and the system does not respond to cooling commands.
|
Indoor Fan Motor Fault / Feedback Error | View Details |
| E7 |
Indoor unit displays E7 and the outdoor unit does not operate.
|
Mode Conflict / Indoor-Outdoor Mismatch or Reversing Valve Error | View Details |
| E8 |
Indoor unit shows E8 and the unit stops with strong airflow or unusual noise.
|
Indoor Fan Overload / Over-speed Protection | View Details |
| E9 |
Indoor unit displays E9 and may leak water or shut down unexpectedly.
|
Full Drain Pan / Water Level Sensor Fault | View Details |
| F0 |
Indoor unit shows F0 and the system does not cool properly.
|
Refrigerant Undercharge / Low Refrigerant Protection | View Details |
| F1 |
Indoor unit displays F1 and runs erratically or not at all.
|
Indoor Ambient Temperature Sensor (Room Thermistor) Fault | View Details |
| F2 |
Indoor unit shows F2 and the unit may short cycle or not reach the set temperature.
|
Evaporator Pipe Temperature Sensor (T3) Fault | View Details |
| F3 |
Indoor unit displays F3 and the outdoor unit may not operate correctly in heating mode.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F4 |
Indoor unit shows F4 and heating or cooling capacity is unstable.
|
Outdoor Coil Temperature Sensor Fault | View Details |
| F5 |
Indoor unit displays F5 and the system may shut down in heating mode.
|
Defrost Sensor / Outdoor Coil Low-Temperature Fault | View Details |
| F6 |
Indoor unit shows F6 and the outdoor fan may not operate correctly.
|
Outdoor Fan Motor Fault | View Details |
| F7 |
Indoor unit displays F7 and the system may not start or may shut down unexpectedly.
|
Outdoor EEPROM / PCB Memory Fault | View Details |
| F8 |
Indoor unit shows F8 and the unit may not respond to the remote or may operate erratically.
|
Indoor EEPROM / PCB Memory Fault | View Details |
| F9 |
Indoor unit displays F9, and the louver may not move correctly.
|
Indoor Louver Stepper Motor Fault | View Details |
| P0 |
Indoor unit displays P0, and the system will not start or stops shortly after starting.
|
Inverter Module / IPM Protection | View Details |
| P1 |
Indoor unit displays P1, and the system may not run or may shut down under load.
|
High/Low Voltage Protection | View Details |
| P2 |
Indoor unit displays P2, and the outdoor unit stops, especially in high ambient temperatures.
|
Compressor Overheating / High Discharge Temperature Protection | View Details |
| P3 |
Indoor unit displays P3, and the system may not start in heating mode or may shut down.
|
Low Outdoor Ambient Protection / Compressor Low-Temperature Protection | View Details |
| P4 |
Indoor unit displays P4, and the system may not run or may shut down under heavy load.
|
Inverter Module Overheating / IPM Temperature Protection | View Details |
| P5 |
Indoor unit displays P5, and the system may not operate in heating mode.
|
Defrost Protection / Outdoor Coil Over-icing | View Details |
| – |
Carrier air conditioner blows warm air in cooling mode
|
Loss of Cooling / Reversing Valve or Refrigerant Issue | View Details |
| – |
Carrier air conditioner cycles between heating and cooling unexpectedly (heat pump models).
|
Reversing Valve or Control Logic Fault | View Details |
| – |
Carrier air conditioner emits a burning or electrical smell.
|
Overheating Electrical Component | View Details |
| – |
Carrier air conditioner emits a musty or moldy smell when starting.
|
Biological Growth on Evaporator Coil and Drain Pan | View Details |
| – |
Carrier air conditioner frequently trips the circuit breaker.
|
Overcurrent / Electrical Overload | View Details |
| – |
Carrier air conditioner indoor unit display is blank, but the unit still runs with the remote.
|
Display Board Failure | View Details |
| – |
Carrier air conditioner indoor unit freezes up with ice on the coil.
|
Evaporator Coil Icing | View Details |
| – |
Carrier air conditioner indoor unit louvers do not move or are stuck in one position.
|
Louver Mechanism Jam | View Details |
| – |
Carrier air conditioner indoor unit runs, but the outdoor unit does not start.
|
Outdoor Unit Non-Start | View Details |
| – |
Carrier air conditioner makes loud rattling or buzzing noises during operation.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Carrier air conditioner remote control does not operate the indoor unit.
|
Remote Control / IR Receiver Failure | View Details |
| – |
Carrier air conditioner runs but does not cool the room effectively.
|
Insufficient Cooling Capacity / Performance Degradation | View Details |
| – |
Carrier air conditioner turns ON but shuts OFF after a few minutes.
|
Short Cycling | View Details |
| – |
Carrier air conditioner will not turn ON at all (no lights, no response).
|
No Power / Control Circuit Dead | View Details |
| – |
Carrier outdoor unit is very loud or vibrates excessively.
|
Outdoor Unit Vibration / Mounting Issue | View Details |
| – |
Carrier outdoor unit runs, but the indoor fan does not blow air.
|
Indoor Blower Failure | View Details |
| – |
Water leaking from the indoor Carrier air conditioner onto the wall or floor.
|
Condensate Drainage Failure | View Details |
No matching codes found
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