WH-MXC16G9E8 — Panasonic Air Conditioner Service Manual (repair manual). Page 127

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16.5.35  Indoor Water Outlet Temperature Sensor Abnormality (F45) 
Malfunction Decision Conditions: 
During startup and operation of cooling and heating, the temperatures detected by the indoor water outlet 
temperature sensor are used to determine sensor errors. 
Malfunction Caused: 
1.  Faulty connector connection. 
2.  Faulty sensor. 
3.  Faulty indoor unit PCB (main). 
Abnormality Judgment: 
Continue for 5 seconds. 
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