Panasonic CS-MS12SD3H, Service Manual, Page: 64 / 78

64
13.5.22 F97 (Compressor Overheating)
Malfunction Decision Conditions

During operation of cooling, when compressor tank temperature data (112°C) is detected by the compressor tank
temperature sensor.
Malfunction Caused

Faulty compressor tank temperature sensor

2/3 way valve closed

Refrigerant shortage (refrigerant leakage)

Faulty outdoor unit PCB

Faulty compressor
Troubleshooting
2/3 way valve closed?
When F97 indication happens
Check the compressor tank temperature
sensor
● Open the 2/3 way valve
YES
NO
Does it conform to the sensor
characteristic chart? ● Replace the compressor tank
temperature sensor
NO
YES
Check for gas leakage
Oil oozing out from the 2/3 way valve?
● Repair the pipe flare or union nuts
● Reclaim and recharge refrigerant
● Replace the capillary tube or dryer
YES
NO
YES
Reclaim and recharge for a specified
amount of fresh refrigerant
Refrigerant cycle abnormality error again?
NO
NO
YES
● Replace outdoor unit PCB
● Replace outdoor unit compressor
● Procedure complete
Check if expansion valve or strainer
clogged (ice formed)
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Caution