Panasonic S-45PU1E5 Technical Data & Service Manual page 299

F06 Inlet temperature sensor (C1) in heat exchanger trouble
1. Error Detection Method
In case of open or short
•
2. Error Diagnosis
1 Sensor
1-1 Is the connector properly connected to PCB?
Trouble
1-2 Is the resistor between the sockets infinity or 0 ?
2 Control
Outdoor unit control PCB failure
2-1
PCB
Replace PCB with a new one.
Failure
5-27
Yes 1-2
No Reconnect & check
Yes Replace sensor.
No 2-1
5