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

This code appears as a reminder to clean the air filter. It does not indicate an error.

dF Code

This code appears when the unit is in defrost mode. It indicates normal operation, not an error.

E0 Error Code

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

E1 or E2 Error Codes

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

E3, E7, E8, EH, En, or Ey Error Codes

These codes indicate failures of various outdoor unit sensors.

E4 Error Code

This code indicates a system abnormality or a low refrigerant level.

E6 Error Code

This code indicates that the indoor unit’s DC fan motor is operating abnormally.

E9 Error Code (Diamante Series)

This code indicates an outdoor unit IPM or compressor drive failure. This article applies to Diamante wall-mounted systems.

E9 Error Code (Quantum Series)

This code indicates an outdoor unit IPM or compressor drive failure. This article applies to Quantum wall-mounted systems.

EA Error Code

This code indicates an outdoor unit current sampling circuit failure or a drive parameter mismatch.

Eb Error Code

This code indicates a communication error between the indoor main PCB and the display board.

EE Error Code

This code indicates an outdoor unit EEPROM error.

EF Error Code

This code indicates that the outdoor unit’s DC fan motor has failed.

EU Error Code

This code indicates that the outdoor unit’s voltage test sensor has failed.

F4 Error Code

This code indicates that the abnormal refrigerant flow protection has been activated.

F5 Error Code

This code indicates that the outdoor unit PFC protection has been activated.

F6 Error Code (Diamante Series)

This code indicates that compressor phase loss or phase reversal protection has been activated. This article applies to Diamante wall-mounted systems.

F6 Error Code (Quantum Series)

This code indicates that compressor phase loss or phase reversal protection has been activated. This article applies to Quantum wall-mounted systems.

F7 Error Code

This code indicates that the outdoor unit IPM abnormal temperature protection has been activated.

F8 Error Code

This code indicates that the outdoor unit’s 4-way valve is reversing abnormally.

F9 Error Code

This code indicates an outdoor unit IPM temperature sensor failure.

FA Error Code

This code indicates an outdoor unit compressor phase current detection circuit failure.

Fd Error Code

This code indicates a communication failure with the refrigerant leak sensor.

Fy Error Code

This code indicates that the system’s low refrigerant protection has been activated.

P0 Error Code

This code indicates that the outdoor unit IPM protection has been activated.

P1 Error Code

This code indicates that overvoltage or undervoltage protection has been activated.

P2 Error Code

This code indicates that overcurrent protection has been activated.

P4 Error Code (Diamante Series)

This code indicates that the outdoor unit’s high discharge temperature protection has been activated. This article applies to Diamante wall-mounted systems.

P4 Error Code (Quantum Series)

This code indicates that the outdoor unit’s high discharge temperature protection has been activated. This article applies to Quantum wall-mounted systems.

P5 Error Code

This code indicates that overcooling protection has been activated during Cooling or Dry mode.

P6 Error Code

This code indicates that overheating protection has been activated during Cooling mode.

P7 Error Code

This code indicates that overheating protection has been activated during Heating mode.

P8 Error Code

This code indicates that outdoor ambient temperature protection has been activated because the temperature is too high or too low.

P9 Error Code

This code indicates that the outdoor unit compressor drive overload protection has been activated.