Panasonic Aquarea T-CAP R32 fault H28

What it means

Indicates an abnormality detected in the solar sensor circuit, checked via connection and resistance against characteristic.

Likely causes

1. Faulty connector connection
2. Faulty indoor sub PCB
3. Indoor communication error

Where to start

1. Check solar temperature sensor wiring and continuity
2. When H28 happens, check connection at CN207 - if not normal, correct sensor connection.
3. If resistance matches characteristic, change Indoor sub PCB.