DOWNLOAD Panasonic WH-MXC16G9E8 Service Manual ↓ Size: 10.68 MB | Pages: 127 in PDF or view online for FREE

127 

 
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. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

128 

 
Malfunction Decision Conditions: 

A current transformer (CT) open circuit is detected by checking the compressor running frequency (≥ rated 
frequency) and CT detected input current (< 0.65A) for continuously 20 seconds. 

 
Malfunction Caused: 

1.  CT defective. 
2.  Faulty outdoor unit PCB. 
3.  Compressor defective (low compression). 

 

Continue 3 times in 20 seconds. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

129 

 
Malfunction Decision Conditions: 

During operation of cooling, when pressure 4.0MPa and above is detected by outdoor high pressure sensor. 

 
Malfunction Caused: 

1.  Dust accumulation in the outdoor unit heat exchanger. 
2.  Air short circuit at outdoor unit. 
3.  2 way valve closed. 
4.  Faulty outdoor unit fan motor. 
5.  Clogged expansion valve or strainer. 
6.  Excessive refrigerant. 
7.  Faulty outdoor high pressure sensor. 
8.  Faulty outdoor unit PCB (main). 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

130 

 

WARNING 

High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged 

sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks.

 

WARNING 

Be sure to switch off all the power supply before performing each of the below action.