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Error Code
The F4 error code indicates an issue with the system’s communication between the control board (PCB) and the sensor, resulting in a malfunction.
Wiring issues between the PCB and the sensors can cause this error.
The PCB may be malfunctioning and failing to communicate with the sensors.
A malfunctioning sensor may send incorrect signals to the PCB.
Turn off the air conditioner for 5–10 minutes, then turn it back on to reset communication.
Check for loose or damaged wiring connections.
A technician can inspect and replace the PCB if necessary.
