Panasonic U-4LE1R8 Service Manual page 68

3. Mini VRF System Alarm Codes
F12 Compressor Intake Temperature Sensor (TS) 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 Outdoor
control
2-1
PC board
3
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.
3-28
Mini VRF SYSTEM
Trouble Diagnosis
Yes 1-2
No Reconnect and check
Yes Replace sensor
No 2-1