Panasonic CS-MS9SD3H Service Manual page 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
When F97 indication happens
Check the compressor tank temperature
sensor
Does it conform to the sensor
characteristic chart?
2/3 way valve closed?
Check for gas leakage
Oil oozing out from the 2/3 way valve?
Check if expansion valve or strainer
clogged (ice formed)
Reclaim and recharge for a specified
amount of fresh refrigerant
Refrigerant cycle abnormality error again?
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
For safety reason and to prevent component
breakdown, always switch off the power
Caution
before remove and connect the component.
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Replace the compressor tank
temperature sensor
Open the 2/3 way valve
Repair the pipe flare or union nuts
Reclaim and recharge refrigerant
Replace the capillary tube or dryer
Replace outdoor unit PCB
Replace outdoor unit compressor
Procedure complete