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93 

 
Malfunction Decision Conditions: 

During startup operation of cooling and heating, the capability rank of indoor checked by the outdoor is used to 
determine connection capability rank abnormality. 

 
Malfunction Caused: 

1.  Wrong model interconnected. 
2.  Wrong indoor unit or outdoor unit PCB (main) used. 
3.  Faulty indoor unit or outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue for 90 seconds. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

94 

 
Malfunction Decision Conditions: 

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

 

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

 
Abnormality Judgment: 

Continue for 5 seconds. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

95 

During startup and operation of cooling and heating, the rotation speed detected by the IPM of water pump motor 
during water pump operation is used to determine abnormal water pump (feedback of rotation > 6,000rpm or < 
1,000rpm). 

 

1.  Operation stop due to short circuit inside the water pump motor winding. 
2.  Operation stop due to breaking of wire inside the water pump motor. 
3.  Operation stop due to breaking of water pump lead wires. 
4.  Operation stop due to water pump motor IPM malfunction. 
5.  Operation error due to faulty indoor unit PCB. 

 

Continue for 5 seconds. 

 
 

 

 
 
 
 

 
 

96 

 
Malfunction Decision Conditions: 

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

 

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

 
Abnormality Judgment: 

Continue for 5 seconds.