WH-MXC16G9E8 - Panasonic Air Conditioner Service Manual (repair manual). Page 114

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114 
16.5.22  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. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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