Panasonic U-4LE1E5 Service Manual page 106

3. Mini VRF System Alarm Codes
F07 Heat Exchanger Inlet Temperature Sensor (C1) Error
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 - 26
Mini VRF SYSTEM
Trouble Diagnosis
Yes 1-2
No Reconnect and check
Yes Replace sensor
No 2-1