Diamante & Quantum Systems
Learn how to resolve different error codes for Diamante and Quantum Systems.
Error Code Table for Diamante & Quantum Series Systems
This article provides an error code table for Diamante and Quantum series systems.
dF Code
This code means the system is in defrost mode.
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 an indoor unit temperature sensor failure or coil temperature sensor failure.
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.
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.
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.
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.
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.