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Error Code
The P4 error code refers to an external communication failure between the indoor and outdoor units. This error typically occurs due to issues with the wiring or PCB components.
Loose or damaged wiring can disrupt communication between the units.
The PCB in either the indoor or outdoor unit may be malfunctioning.
Power surges or fluctuations may cause communication failures.
urn off the air conditioner for 5–10 minutes, then turn it back on to reset communication.
Inspect the wiring between the indoor and outdoor units for any loose or damaged connections.
A professional can inspect and replace the PCB if needed.
