Haier Wired Controller / Communication Error (where fitted)

Indoor unit displays C1 and may not respond correctly to remote control temperature settings.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose wired controller cable, Incorrect wiring between controller and indoor PCB, Faulty wired controller, Faulty indoor PCB communication port

Safety first: Turn off power before working on control wiring.

Check controller cable: Inspect the cable from the wired controller to the indoor unit for damage or loose connections.
Verify polarity: Ensure terminals are wired according to the Haier wiring diagram.
Test with another controller: If available, connect a known-good wired controller to see if C1 clears.
If unresolved: The indoor PCB communication circuit may be faulty and require replacement.

Medium 3/5

Wired Controller

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