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79
15.4.25 F97 (Compressor Overheating)
Malfunction Decision Conditions
During operation of cooling and heating, when compressor tank temperature data 233.6°F (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
When F97 indication happens.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Replace the compressor tank.
temperature sensor.
Repair the pipe flare or union nuts.
Reclaim and recharge refrigerant.
Open the 2/3 way valve.
Replace expansion valve and/or strainer.
Reclaim and recharge refrigerant.
Procedure complete.
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?
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Replace outdoor unit PCB.
Replace outdoor unit compressor.
Caution
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