Panasonic CS-E12RB4UW Service Manual page 82

15.4.22 F97 (Compressor Overheating)
Malfunction Decision Conditions

During operation of cooling and heating, when compressor tank temperature data (112°C (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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