Panasonic WH-ADC0309H3E Service Manual page 155

17.5.6 Abnormal Solar Sensor (H28)
Malfunction Caused:
1 Faulty connector connection.
2 Faulty solar sensor.
3 Faulty indoor sub PCB.
Abnormality Judgment:
Continue for 5 seconds.
Abnormal solar sensor
H28 happens check connection at CN207 normal?
Measure resistance of sensor match characteristic?
Change Indoor sub PCB
YES
YES
155
For safety reason and to prevent
component breakdown, always switch
Caution
off the power before remove and
connect the component.
NO
● Correct sensor connection
NO
● Change solar sensor