Panasonic U-8MF2E8 Service Manual page 51

11. Alarm Information
11-5. Temperature Sensor Failure
When the temperature sensor fails or do not connect with PCB, "F" alarm occurs (excluding discharge temperature
sensor for compressor).
Alarm display
F06 EXG1
F07 EXL1
F08 AIR TEMP
F12 SCT
F14 SCG
F23 EXG2
F24 EXL2
H08 OIL1
H27 OIL2
11-6 Magnet Switch Failure
The constant-speed compressor cannot stop when the contacts of the magnet switch for compressor melt and
cannot cut out.
In this case, system compulsorily operates in cooling mode for safety.
All indoor units operate cooling mode and their fan mode is L (Low Speed).
The fan motor in the outdoor unit which magnet switch cannot cut off operates at maximum rotation speed.
* Inverter compressor and the other constant speed compressor which magnet switch is normal do not operate.
* The constant speed compressor contains an over load relay that detects abnormal temperature.
Therefore, there is no risk of danger.
Gas temperature sensor in heat exchanger 1
Liquid temperature sensor in heat exchanger 1
Ambient air temperature
Suction temperature
Temp. sensor at refrigerant gas outlet of dual-tube
Gas temperature sensor in heat exchanger 2
Liquid temperature sensor in heat exchanger 2
Oil temperature sensor 1 (Inverter compressor)
Oil temperature sensor 2 (Constant-speed compressor 1)
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3WAY SYSTEM
Control Functions
1