H12

Malfunction Decision Conditions

During startup, error code appears when different types of indoor and outdoor units are interconnected.

Wrong models interconnected.
Wrong indoor unit or outdoor unit PCBs mounted.
Indoor unit or outdoor unit PCBs defective.
Indoor-outdoor unit signal transmission error due to wrong wiring.
Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor and outdoor units.

When abnormality indication starts again

↓

Check the indoor and outdoor unit connection wires

⚠

Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

↓

Is there any wiring error?

YES
→

Correct the indoor-outdoor units connection wires

↓

Check indoor and outdoor units model number.

↓

Is indoor unit and outdoor unit model numbers matched?

NO
→

Match the compatible model(s)

YES

↓

Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part Lists

YES

↓

Matched compatibility?

NO
→

Change for the specified indoor or outdoor unit PCB

↓

►

Replace the indoor and outdoor unit PCBs