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113 

A compressor rotation failure is detected by checking the compressor running condition through the position 
detection circuit. 

1  Compressor terminal disconnect. 
2  Faulty outdoor unit PCB (main). 
3  Faulty compressor. 

Continue 4 times in 20 minutes. 

 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

114 

The rotation speed detected by the Hall IC of the fan motor during fan motor operation is used to determine 
abnormal fan motor (feedback of rotation > 2550 rpm or < 50 rpm). 

1  Operation stop due to short circuit inside the fan motor winding. 
2  Operation stop due to breaking of wire inside the fan motor. 
3  Operation stop due to breaking of fan motor lead wires. 
4  Operation stop due to fan motor Hall IC malfunction. 
5  Operation error due to faulty outdoor unit PCB. 

Continue 2 times in 30 minutes. 
 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

115 

During operation of cooling and heating, when outdoor current above 24.1 A (Heating) and 16.4 A (Cooling) 
[UD07FE5)] and 28.1 A (Heating) and 18.1 A (Cooling) [UD09FE5)] is detected by the current transformer (CT) in 
the outdoor unit PCB. 

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

Continue 3 times in 20 minutes. 
 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

116 

During operation of cooling and heating, when temperature above 112°C is detected by the compressor tank 
temperature sensor. 

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. 

Continue 4 times in 30 minutes.