Panasonic WH-ADC0309H3E Service Manual page 158

17.5.9 Brand Code Not Matching (H38)
Malfunction Caused:
1 Indoor and outdoor brand code not match.
Brand code not match
Check the brand of indoor and outdoor unit both Panasonic?
Change PCB outdoor
YES
158
For safety reason and to prevent
component breakdown, always switch
Caution
off the power before remove and
connect the component.
NO
● Use only Panasonic units.
● Change to Panasonic unit.