Diamante & Quantum Wall-Mounted Systems

Learn how to resolve different error codes for Diamante and Quantum wall-mounted systems.

Error Code Table for Diamante & Quantum Wall-Mounted Systems

This article provides an error code table for Diamante and Quantum wall-mounted systems.

CL Code

Filter Cleaning Reminder. After the unit has run for a total of 500 hours, the display shows "CL" to remind you to clean the air filter. This is a reminder, not an error code.

dF Code

The display shows “dF” when the unit is in defrost mode. This is normal operation, not an error code.

E0 Error Code

This error code indicates a communication failure between the indoor and outdoor units.

E1 or E2 Error Codes

These error codes indicate a failure of the indoor unit room temperature sensor or coil temperature sensor.

E3, E7, or E8 Error Codes

These error codes indicate different sensor failures.

E4 Error Code

This error code indicates the AC cooling system is operating abnormally.

E6 Error Code

This error code indicates the indoor unit's PG fan motor or DC fan motor is operating abnormally.

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.

EU Error Code

This error code indicates the outdoor unit's voltage test sensor has experienced a fault.

F4 Error Code

This error code indicates the system is undergoing cooling system gas flow abnormal protection.

F5 Error Code

This error code indicates the system is undergoing PFC over-current protection.

F6 Error Code (Diamante Series)

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

F7 Error Code

This error code indicates the system is undergoing IPM over-temperature protection.

F6 Error Code (Quantum Series)

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

F8 Error Code

This error code indicates the system's 4-way valve is reversing abnormally.

Fd Error Code

This error code indicates the system's refrigerant detector is experiencing a fault.

Fy Error Code

This error code indicates the system detects refrigerant leakage.

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 Quantum Ultra Multi-Zone systems.

Hd Error Code

This error code flashes when the leak detector within the indoor unit detects refrigerant.

PA Error Code (Multi-Zone Quantum Ultra Series)

This error code is for Quantum Ultra Multi-Zone systems, and indicates the units are experiencing a mode conflict.

P0 Error Code

This error code indicates the IPM is undergoing protection.

P1 Error Code

This error code indicates the system is undergoing over-voltage or under-voltage protection.

P2 Error Code

This error code indicates the system is undergoing over-current protection.

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.

P6 Error Code

This error code indicates the system is undergoing overheating protection in Cooling mode.

P7 Error Code

This error code indicates the system is undergoing overheating protection in Heating mode.

P8 Error Code

This error code indicates the system is undergoing outdoor over-temperature protection or outdoor under-temperature protection.

P9 Error Code

This error code indicates the system is undergoing compressor driving protection.