Carrier Mini Split Error Codes List

Carrier units will usually display the error code on the unit but can also use LED flashes to point to a problem.

Below are the error codes for a Carrier mini split and their meanings.

Note: It is always good to get the manual for your specific Carrier model as there may be differences in some cases.

Carrier Mini Split Error Codes List

• 08: Defrost Mode 1
• 0A: Defrost Mode 2
• EO: Indoor unit EEPROM parameter error.
• E1: Communication between indoor and outdoor units.
• E2: Indoor outdoor units communication error.
• E3: Indoor fan speed malfunction.
• E4: Indoor room temperature sensor (T1) malfunction.
• E5: Evaporator coil temperature sensor (T2) malfunction.
• E6: Indoor Unit EEPROM Parameter Error.
• EE: Water level alarm malfunction (Only for cassette and duct types).
• F0: Low charge or refrigerant system blockage.
• FO: Outdoor AC Current protection.
• EC: Refrigerant leak detection.
• F1: Outdoor ambient temperature sensor (T4) malfunction.
• F2: Condenser coil temperature sensor (T3) malfunction.
• F3: Compressor discharge temperature sensor (T5) malfunction.
• F4: Outdoor unit EEPROM parameter.
• F5: Outdoor fan speed malfunction.
• F6: Indoor coil outlet sensor malfunction (located on outdoor unit low).
• P0: Inverter module (IPM) malfunction.
• P1: Over voltage or under voltage protection.
• P2: High temperature protection of compressor
• P4: Compressor five malfunction.
• P5: Indoor unit mode conflict.
• P6: Low pressure protection.
• P4: Inverter compressor drive error.
• F8: Compressor Suction Temperature sensor defective.
• L3: Drive Phase current overload defective.
• L4: Phase Current Sampling defective.
• L1: Drive bus voltage overload protection.
• L2: Drive bus voltage overflow protection.
• P5: Compressor phase current protection.
• P6: Outdoor over high/over-low DC voltage protection.
• P7: IPM Temperature over heat protection.
• P8: Compressor discharge Temperature overheat protection.
• P9: Cooling indoor Unit anti-freezing protection.
• PU: Cooling Outdoor Coil over heat protection.
• PE: Heating indoor coil over heat protection.
• PC: Cooling outdoor ambient Temperature over-low protection.
• PH: Heating outdoor ambient Temperature over-high protection.
• E2: Zero crossing signal detection error.

Summary
Troubleshooting a Carrier mini split begins by looking up the error code on a chart list which will list the cause.

Once the code is matched, the error will point to the unit’s problem.

For example, an E1 error code is a communication problem between indoor and outdoor units.

This is usually in the communication line that goes between the two units.

Checking all the connections and using multi-meter to check for any shorts or open usually would solve the issue.

This is only one example with other error codes being used the same way.