WH-MXC16G9E8 - Panasonic Air Conditioner Service Manual (repair manual). Page 117

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117 
16.5.25  Refrigeration Cycle Abnormality (F24) 
 
Malfunction Decision Conditions: 
1.  During operation of cooling and heating, compressor frequency > Frated. 
2.  During operation of cooling and heating, running current: 0.65A < I < 1.65A. 
3.  During operation of cooling, water inlet temperature - indoor refrigerant liquid temperature < 5°C. 
4.  During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5°C. 
 
Malfunction Caused: 
1.  Faulty water inlet or indoor refrigerant liquid temperature sensors. 
2.  2/3 way valve closed. 
3.  Refrigerant shortage (refrigerant leakage). 
4.  Clogged expansion valve or strainer. 
5.  Faulty outdoor unit PCB (main). 
6.  Poor compression of compressor. 
 
Abnormality Judgment: 
Continue 2 times in 20 minutes. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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