Self-Diagnosis Method - Panasonic WH-MHF09G3E5 Service Manual

16.5 Self-diagnosis Method

16.5.1 Connection Capability Rank Abnormality (H12)
Malfunction Decision Conditions:
During startup operation of heating, the capability rank of indoor checked by the outdoor is used to determine
connection capability rank abnormality.
Malfunction Caused:
1 Wrong model interconnected.
2 Wrong indoor unit or outdoor unit PCB (main) used.
3 Faulty indoor unit or outdoor unit PCB (main).
Abnormality Judgment:
Continue for 90 seconds.
Troubleshooting:
Check indoor and outdoor
units model number.
Is the indoor and outdoor
model number matched?
Yes
Check the spare part numbers of
the indoor and outdoor unit PCBs
and compare with their Part Lists.
Matched compatibility?
Yes
No
Match the compatible
model.
No
Change for specified indoor
or outdoor unit PCB (main).
Replace the indoor and
outdoor unit PCBs (main).
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