By Error Code

CL error code

This error code indicates the system needs a filter cleaning. This troubleshooting article is for Diamante and Quantum series systems.

E0 error code

This error code indicates a communication failure between the indoor and outdoor units. This troubleshooting article is for Diamante and Quantum series systems.

E1 or E2 error codes

These error codes indicate an indoor room temperature sensor failure or coil temperature sensor failure. This troubleshooting article is for Diamante and Quantum series systems.

E3, E7, or E8 error codes

These error codes indicate different sensor failures. This troubleshooting article is for Diamante and Quantum series systems.

E4 error code

This error code indicates the AC cooling system is operating abnormally. This troubleshooting article is for Diamante and Quantum series systems.

E6 error code

This error code indicates the indoor unit's PG fan motor or DC fan motor is operating abnormally. This troubleshooting article is for Diamante and Quantum series systems.

E9 error code (Diamante Series)

This error code indicates the IPM or compressor driving control is operating abnormally. This troubleshooting article is for Diamante series systems.

E9 error code (Quantum Series)

This error code indicates the IPM or compressor driving control is operating abnormally. This troubleshooting article is for Quantum series systems.

EF error code

This error code indicates the outdoor unit's DC fan motor has failed. This troubleshooting article is for Diamante and Quantum series systems.

EU error code

This error code indicates outdoor unit voltage test sensor failure. This troubleshooting article is for Diamante and Quantum series systems.

F4 error code

This error code indicates the unit is undergoing cooling system gas flow abnormal protection. This troubleshooting article is for Diamante and Quantum series systems.

F5 error code

This error code indicates the system is undergoing PFC over-current protection. This troubleshooting article is for Diamante and Quantum series systems.

F6 error code (Diamante Series)

This error code indicates the system is undergoing anti-phase protection. This troubleshooting article is for Diamante series systems.

F6 error code (Quantum Series)

This error code indicates the system is undergoing anti-phase protection. This troubleshooting article is for Quantum series systems.

F7 error code

This error code indicates the system is undergoing IPM over-temperature protection. This troubleshooting article is for Diamante and Quantum series systems.

F8 error code

This error code indicates the system's 4-way valve is reversing abnormally. This troubleshooting article is for Diamante and Quantum series systems.

Fd error code

This error code indicates the system's refrigerant detector is experiencing a fault. This troubleshooting article is for Diamante and Quantum series systems.

Fy error code

This error code indicates the system detects refrigerant leakage. This troubleshooting article is for Diamante and Quantum series systems.

H1 or H2 error code (Multi-Zone Quantum Ultra Series)

These error codes indicate a high pressure switch failure or low pressure switch failure. This article is for multi-zone Quantum Ultra series systems.

P0 error code

This error code indicates the IPM is undergoing protection. This troubleshooting article is for Diamante and Quantum series systems.

P1 error code

This error code indicates the system is undergoing over-voltage or under-voltage protection. This troubleshooting article is for Diamante and Quantum series systems.

P2 error code

This error code indicates the system is undergoing over-current protection. This troubleshooting article is for Diamante and Quantum series systems.

P4 error code (Diamante Series)

This error code indicates the outdoor unit is undergoing discharge temperature overheating protection. This troubleshooting article is for Diamante series systems.

P4 error code (Quantum Series)

This error code indicates the outdoor unit is undergoing discharge temperature overheating protection. This troubleshooting article is for Quantum series systems.

P5 error code

This error code indicates the system is undergoing sub-cooling protection in Cooling/Dry mode. This troubleshooting article is for Diamante and Quantum series systems.

P6 error code

This error code indicates the system is undergoing overheating protection in Cooling mode. This troubleshooting article is for Diamante and Quantum series systems.

P7 error code

This error code indicates the system is undergoing overheating protection in Heating mode. This troubleshooting article is for Diamante and Quantum series systems.

P8 error code

This error code indicates the system is undergoing outdoor over-temperature protection or outdoor under-temperature protection. This article is for Diamante/Quantum systems.

P9 error code

This error code indicates the system is undergoing compressor driving protection. This troubleshooting article is for Diamante and Quantum series systems.

PA error code (Multi-Zone Quantum Ultra Series)

This error code is for multi-zone Quantum Ultra systems and indicates the units are experiencing a mode conflict.