Panasonic CS-Z20TKR Service Manual page 119

17.4.2 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.
Check the indoor and outdoor unit connection wires.
Is there any wiring error?
Check indoor and outdoor units model number.
Is indoor unit and outdoor unit model numbers matched?
Check the spare part numbers of the indoor and outdoor unit
PCBs and compare with their Part Lists.
Matched compatibility?
NO
YES
YES
119
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
YES
Correct the indoor-outdoor units connection wires.
NO
Match the compatible model(s).
NO
Change for the specified indoor or outdoor unit
PCB.
Replace the indoor and outdoor unit PCBs.