Panasonic S-36PU1E5 Technical Data & Service Manual page 348

F07 Intermediate temperature (C2) in heat exchanger trouble
1. Error Detection Method
It is judged an error when open circuit or short circuit.
2. Error Diagnosis
1 Sensor
1-1
1-2
2 PC board
2-1
5
Sensor connector is connected to PC board properly.
Resistance between sockets is infinity or 0 ohm.
Replace PC board because of outdoor control PC board failure.
5-28
Yes 1-2
No Reconnect and check
Yes Replace sensor
No 2-1