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17.5.22 Compressor Overheating (F20)
Malfunction Decision Conditions:
During operation of cooling and heating, when temperature above 112°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.
Troubleshooting:
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.
Does it conform to the
sensor characteristic chart?
Check the 2/3 way valve.
Check for clogged expansion
valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
Is abnormality happened
again?
Reclaim and recharge for a
specified amount of fresh refrigerant.
Is the 2/3 way valve closed?
Check for gas leakage.
Is the oil oozing out from the
2/3 way valve?
Replace the compressor
tank temperature sensor.
Open the 2/3 way valve.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
- Repair the pipe flare or
union nuts.
- Reclaim and recharge
refrigerant.
- Repair expansion valve
and/or strainer.
- Reclaim and recharge
refrigerant.
- Replace the outdoor unit
PCB (main).
- Replace the compressor.
Procedure complete.
Summary of Contents for WH-ADC0916G9E8
Page 34: ...34 4 2 Outdoor Unit Air inlet rear Air inlet side Air inlet side Air outlet Air outlet ...
Page 40: ...40 8 Wiring Connection Diagram 8 1 Indoor Unit RY HT L1 RY HT L2 RY V3 RY V2 RY HT L3 ...
Page 100: ...100 Note Default value refer Location of Control and Component OPERATION ACTUAL ...