Panasonic S-45PU1E5 Technical Data & Service Manual page 301

F08 Outdoor air temperature sensor (TO) 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.
5-29
Yes 1-2
No Reconnect and check
Yes Replace sensor
No 2-1
5