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113 

During operation of cooling and heating, when outdoor current above 27.9A is detected by the current 
transformer (CT) in the outdoor unit PCB. 

 
Malfunction Caused: 

1.  Excessive refrigerant. 
2.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue 3 times in 20 minutes. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

114 

 
Malfunction Decision Conditions: 

During operation of cooling and heating, when temperature above 107°C is detected by the compressor tank 
temperature sensor. 

 
Malfunction Caused: 

1.  Faulty compressor tank temperature sensor. 
2.  2/3 way valve closed. 
3.  Refrigerant shortage (refrigerant leakage). 
4.  Clogged expansion valve or strainer. 
5.  Faulty outdoor unit PCB (main). 
6.  Faulty compressor. 

 
Abnormality Judgment: 

Continue 4 times in 30 minutes. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

115 

 
Malfunction Decision Conditions: 

During operation of cooling and heating, when temperature 95°C is detected by the outdoor IPM temperature 
sensor. 

 

1.  Faulty outdoor unit fan motor. 
2.  Faulty outdoor unit PCB (main). 

 
Abnormality Judgment: 

Continue 3 times in 30 minutes. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

116 

 
Malfunction Decision Conditions: 

During operation of cooling and heating, when outdoor DC current is above 54.0A ± 4.0A (for: UD12~16CE) is 
detected by the IPM DC Peak sensing circuitry in the outdoor unit PCB (main). 

 
Malfunction Caused: 

1.  Faulty outdoor unit PCB (main). 
2.  Faulty compressor. 

 

Continue for 7 times.