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16.5 Self-diagnosis Method
16.5.1 Connection Capability Rank Abnormality (H12)
Malfunction Decision Conditions:
During startup operation of cooling and 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.
Check indoor and outdoor
units model number.
Match the compatible
model.
No
Is the indoor and outdoor
model number matched?
Check the spare part numbers of
the indoor and outdoor unit PCBs
and compare with their Part Lists.
Matched compatibility?
Change for specified indoor
or outdoor unit PCB (main).
Yes
No
Yes
Replace the indoor and
outdoor unit PCBs (main).
Troubleshooting:
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