Panasonic CS-CZ35ZKE - F97: Compressor Overheating Protection

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17.5.27 F97 (Compressor Overheating)
Malfunction Decision Conditions
 During operation of cooling and heating, 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
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
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.
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
● Replace expansion valve and/or strainer
● Reclaim and recharge refrigerant
● Procedure complete
Check if expansion valve or strainer
clogged (ice formed)
Caution