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15.4.2 H12 (Indoor/Outdoor Capacity Rank Mismatched)
Malfunction Decision Conditions
During startup, error code appears when different types of indoor and outdoor units are interconnected.
Malfunction Caused
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.
Troubleshooting
When abnormality indication starts again.
Is there any wiring error?
YES
Matched compatibility?
Correct the indoor-outdoor units connection wires.
Check the indoor and outdoor unit connection wires.
Check the spare part numbers of the indoor and outdoor unit
PCBs and compare with their Part Lists.
Change for the specified indoor or outdoor unit
PCB.
Replace the indoor and outdoor u nit PCBs.
NO
YES
NO
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
NO
Is indoor unit and outdoor unit model numbers matched?
Match the compatible model(s).
YES
Check indoor and outdoor units model number.
Caution
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