Carrier Air Conditioner Error Codes

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Problems with your Carrier air conditioning system would often come up with error codes that would be displayed on the screen of your remote control, or indoor unit. Any problems with your indoor or outdoor unit would show an error code as the air conditioner detects an issue with your aircon.

In this complete guide, we’ll show you the different indoor and outdoor Carrier fault codes that you may encounter. These error codes will indicate the problem with your air conditioning system so you can troubleshoot the underlying issue with your AC system.

Indoor 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

Outdoor 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 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.

Related article: Carrier Aircon Troubleshooting Guide

Luce Aircon is your trusted and affordable Singaporean aircon servicing company. We have a team of professional technicians who have decades of experience in the aircon industry. You can count on us and on them to find the issue and fix it!

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