Panasonic CS-E18NKUA Service Manual page 64

15.4.18 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
Refrigerant shortage (refrigerant leakage).
2/3 way valve closed.
Detection error due to faulty compressor tank temperature sensor.
Troubleshooting
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