Panasonic CS-E18SD3UAW service manual - Page 93

F97 Compressor Overheating

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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. Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Does it conform to the sensor characteristic chart? YES 2/3 way valve closed? NO Check for gas leakage. Oil oozing out from the 2/3 way valve? NO Check if expansion valve or strainer clogged (ice formed) NO Reclaim and recharge for a specified amount of fresh refrigerant Refrigerant cycle abnormality error again? NO NO YES YES YES YES 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 93

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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.
NO
Replace 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?
Refrigerant cycle abnormality error again?
Check if expansion valve or strainer
clogged (ice formed)
Reclaim and recharge for a specified
amount of fresh refrigerant
YES
YES
NO
NO
NO
NO
Open the 2/3 way valve.
YES
YES
YES
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
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
Caution