Panasonic CS-E9SD3UAW Service Manual page 93

15.5.22 F97 (Compressor Overheating)
Malfunction Decision Conditions

During operation of cooling and heating, when compressor tank temperature data (233.6°F) 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.
Replace the compressor tank
temperature sensor.
Open the 2/3 way valve.
Repair the pipe flare or union nuts.
Reclaim and recharge refrigerant.
Replace expansion valve and/or strainer
Reclaim and recharge refrigerant
Replace outdoor unit PCB
Replace outdoor unit compressor
Procedure complete
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