Panasonic S-45PU1E5 Technical Data & Service Manual page 639

F07 Intermediate Temperature Sensor (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 Sensor connector is connected to PC board properly.
1-2 Resistance between sockets is infinity or 0 ohm.
2 PC board
2-1 Replace PC board because of outdoor control PC board failure.
5-31
Yes 1-2
No Reconnect and check
Yes Replace sensor
No 2-1
5