WH-MXC16G9E8 - Panasonic Air Conditioner Service Manual (repair manual). Page 118

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118 
16.5.26  Four Way Valve Abnormality (F25) 
 
Malfunction Decision Conditions: 
1.  During heating operation, when the indoor pipe temperature of thermostat ON indoor unit < 0°C. 
2.  During cooling operation, when the indoor pipe temperature of thermostat ON indoor unit > 45°C. 
 
Malfunction Caused: 
1.  Faulty sensor. 
2.  Faulty connector connection. 
3.  Faulty outdoor unit PCB (noise filter/main). 
4.  Faulty four way valve. 
 
Abnormality Judgment: 
Continue 4 times in 30 minutes. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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