Panasonic S-36PU1E5A Service Manual page 586

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
Trouble
1-2
2 Control
2-1
PCB
Failure
5
Is the connector properly connected to PCB?
Is the resistor between the sockets infinity or 0Ω?
Outdoor unit control PCB failure
Replace PCB with a new one.
5-30
Yes 1-2
No Reconnect & check
Yes Replace sensor.
No 2-1