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123 

 
Malfunction Decision Conditions: 

During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe 
temperature sensor are used to determine sensor error. 

 
Malfunction Caused: 

1.  Faulty connector connection. 
2.  Faulty sensor. 
3.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue for 5 seconds. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

124 

 
Malfunction Decision Conditions: 

During operation of cooling and heating, when the PFC protection circuitry in the outdoor unit PCB (main) senses 
abnormal high DC voltage level. 

 
Malfunction Caused: 

1.  Power supply surge. 
2.  Compressor windings not uniform. 
3.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue 4 times in 10 minutes. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

125 

During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature 
sensor are used to determine sensor error. 

 
Malfunction Caused: 

1.  Faulty connector connection. 
2.  Faulty sensor. 
3.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue for 5 seconds. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

126 

 

During startup and operation of cooling and heating, the temperatures detected by the outdoor defrost 
temperature sensor are used to determine sensor error. 

 
Malfunction Caused: 

1.  Faulty connector connection. 
2.  Faulty sensor. 
3.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue for 5 seconds.