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Error Code
The E4 error code refers to a communication failure between the indoor and outdoor units. This can result in improper system operation and is often caused by wiring or PCB issues.
Wiring between the indoor and outdoor units may be loose or damaged.
The PCB in the indoor or outdoor unit may be malfunctioning.
Power fluctuations can disrupt communication between the units.
Turn off the system for 5–10 minutes, then turn it back on to reset the communication.
Check all wiring between the indoor and outdoor units for damage.
A technician can inspect and replace the PCB if necessary.
