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16.5.31 Compressor Overheating (F20)
Malfunction Decision Conditions:
During operation of cooling and heating, when temperature above 107°C is detected by the compressor tank
temperature sensor.
Malfunction Caused:
1 Faulty compressor tank temperature sensor.
2 2/3 way valve closed.
3 Refrigerant shortage (refrigerant leakage).
4 Clogged expansion valve or strainer.
5 Faulty outdoor unit PCB (main).
6 Faulty compressor.
Abnormality Judgment:
Continue 4 times in 30 minutes.
Is the 2/3 way valve closed?
No
Check the compressor tank
temperature sensor.
Replace the compressor
tank temperature sensor.
No
Does it conform to the
sensor characteristic chart?
Yes
Yes
No
Open the 2/3 way valve.
Yes
Check for gas leakage.
Is the oil oozing out from
the 2/3 way valve?
Check the 2/3 way valve.
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
- Replace expansion valve
and/or strainer
- Reclaim and recharge
refrigerant
Yes
No
Reclaim and recharge for a
specified amount of fresh refrigerant.
- Replace the outdoor unit
PCB (main)
- Replace the compressor
Yes
No
Is abnormality happened
again?
Procedure complete
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
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