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19.5 Self-diagnosis Method
19.5.1 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.
Troubleshooting:
Yes
No
No
Yes
No
No
Has the installation set-up being
modified at control panel.
Does H12 error occur after a certain period of usage?
Does H12 error occur immediately after installation?
Rectify the model selection.
Has any indoor or outdoor PCB being replaced or
serviced?
Check the spare part number and compare against the
part list.
Does spare part number match with the indoor/outdoor
model?
Has the indoor PCB being replaced anew?
Set the capacity rank at control panel (refer I/I). Has the capacity rank being set at the control panel?
After capacity is set, turn off the breaker and turn on the
power again to operate the unit.
Yes
No
Change indoor PCB and/or
outdoor PCb for specified model.
No
No
Yes
Yes
Yes
Yes
No
WH-ADC0309J3E5UK
All In One
Bi-Bloc
Indoor Unit
Is the outdoor unit model and capacity within the rank of
allowable indoor unit capacity?
WH-SDC0305J3E5
WH-SDC0709J3E5
WH-ADC0309J3E5
WH-ADC0309J3E5AN
WH-ADC0309J3E5B WH-UD07JE5
WH-UD09JE5
Outdoor Unit
WH-UD03JE5
WH-UD05JE5
WH-UD07JE5
WH-UD09JE5
WH-UD03JE5
WH-UD05JE5
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