The list below features all the malfunction error codes for Carrier air conditioners and their potential causes. You may determine the state and problem of the air conditioner or air conditioning system by looking up the error code.
Carrier Air Conditioner Indoor Unit Error Codes
| Code | Possible Cause |
|---|---|
| E0 | Indoor unit EEPROM parameter error |
| E1 | Indoor / outdoor units communication error |
| E3 | Indoor fan speed has been out of control |
| E4 | Indoor room temperature sensor T1 open circuit or short circuit |
| E5 | Evaporator coil temperature sensor T2 open circuit or short circuit |
| EC | Refrigerant Leakage Detection |
| F1 | Outdoor ambient temperature sensor T4 open circuit or short circuit |
| F2 | Condenser coil temperature sensor T3 open circuit or short circuit |
| F3 | Compressor discharge temperature sensor T5 open circuit or short circuit |
| F4 | Outdoor unit EEPROM parameter error |
| F5 | Outdoor fan speed has been out of control |
| P0 | IPM malfunction or IGBT over-strong current protection |
| P1 | Over voltage or over low voltage protection |
| P2 | High temperature protection of compressor top diagnosis and solution |
| P4 | Inverter compressor drive error |
| P5 | Mode conflict |
| P6 | Compressor voltage protection |
Carrier Air Conditioner Outdoor Unit Error Codes
| Code | Possible Cause |
|---|---|
| E0 | Outdoor EEPROM malfunction |
| E2 | Indoor/outdoor units communication error |
| E3 | Communication malfunction between IPM board and outdoor main board |
| E4 | Open or short circuit of outdoor unit temperature sensor |
| E5 | Voltage protection |
| E8 | Outdoor fan speed malfunction |
| F1 | No A Indoor unit coil outlet temperature sensor or connector of sensor is defective |
| F2 | No B Indoor unit coil outlet temperature sensor or connector of sensor is defective |
| F3 | No C Indoor unit coil outlet temperature sensor or connector of sensor is defective |
| F4 | No D Indoor unit coil outlet temperature sensor or connector of sensor is defective |
| F5 | No E Indoor unit coil outlet temperature sensor or connector of sensor is defective |
| P1 | High pressure protection |
| P2 | Low pressure protection |
| P3 | Current protection of compressor |
| P4 | Temperature protection of compressor |
| P5 | High temperature protection of condenser |
| P6 | IPM module protection |
Other Carrier Air Conditioner Error Codes
| Code | Possible Cause |
|---|---|
| DN | Communication error between main board and EXV. |
| EC | Refrigerant leakage detection. |
| EE | Memory card error. |
| EN | Frequency limitation for module circuit protection. |
| EU | Frequency limitation for module temperature protection. |
| FH | Frequency limitation for freeze protection. |
| H1 | Defrost or heating oil return cycle. |
| H3 | Compressor overheat protection. |
| H5 | IPM Protection. |
| H7 | Compressor speed reduction. |
| HC | PFC protection malfunction. |
| HE | Compressor demagnetizing protection. |
| L9 | Compressor high voltage protection. |
| LC | Compressor start-up failure. |
| LD | Compressor phase loss protection. |
| LE | Compressor stalling. |
| LF | Compressor over-speed protection. |
| LP | Indoor and outdoor units mismatch. |
| PA | Input current protection. |
| PC | Current sensor malfunction. |
| PD | Current sensor miss-wiring protection. |
| PF | Inverter board ambient temperature sensor malfunction. |
| PH | High voltage protection. |
| PL | Low voltage protection. |
| PP | Abnormal input AC voltage. |
| PU | Capacitor charging malfunction. |
These are the common issues for Carrier Air Conditioners
| Problem | Possible Causes | Solutions |
|---|---|---|
| Air Conditioner is Freezing Up | Dirty filter/coils; Refrigerant leak | Clean the AC unit; Contact a technician |
| Air Conditioner is Making a Whirring Sound | Faulty fan motor | Replace fan motor |
| Air Conditioner is Short Cycling | Clogged filter; Faulty capacitor/condenser | Clean AC unit; Inspect the components of the AC |
| Air Conditioner has Electrical Issues | Loose wires; Tripped breakers | Contact an electrician |
The Air Conditioner is Freezing Up
A common AC issue with several air conditioning brands is a frozen air conditioner. A refrigerant leak may also be the cause of a frozen evaporator coil, but filthy air filters and coils are the usual causes of air conditioner freeze-ups.
After letting the ice melt, clean your unit to get rid of extra dust and dirt from the air filter. If clearing the clogged air filter does not resolve the issue, get in touch with an AC contractor to locate and address the refrigerant line leak.
My Air Conditioner is Making a Whizzing Noise
The noise produced by air conditioners is minimal. The unit’s motors may ordinarily produce quiet, low-pitched humming sounds, but a loud, whizzing sound denotes a problem. A whirring, engine sound is frequently a sign of a malfunctioning fan motor, which must be replaced by a qualified professional to resolve the problem and stop additional harm to your machine.
My Air Conditioner is Short Cycling
You may tell something is wrong with your air conditioning system when it keeps turning on and off for many minutes at a time. Short cycling is the problem that keeps your air conditioner from adequately chilling the space.
Quick repairs for clogged filters and blocked return air ducts are frequently the cause of short cycling. Take a moment to clean your unit and get rid of any obstructions or clogs. If this doesn’t resolve the issue, get your HVAC system inspected by an air conditioning contractor. It’s possible that there are issues with the condensing unit, capacitor, or other hard-to-find parts.
My Air Conditioner has Electrical Problems
Is the circuit breaker being tripped by your air conditioner? Simply turn the switch back on and unplug as many of the gadgets from around the house, and the issue ought to go away. But any problems relating to the power supply, including loose sockets, damaged wiring, or power outages, need to be handled by an expert, so get in touch with your electrician right now.
Air Conditioner Brand Error Codes
Click on the brand below for their air conditioner error codes and faults.