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89 

  During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the 

compressor tank temperature sensor. 

  Faulty compressor tank temperature sensor 

  2/3 way valve closed 

 Refrigerant 

shortage 

(refrigerant leakage) 

  Faulty outdoor unit PCB 

 Faulty 

compressor 

 
Troubleshooting 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

90 

  During operation of cooling and heating, when an input over-current (X value in Total Running Current Control) is 

detected by checking the input current value being detected by current transformer (CT) with the compressor 
running. 

 
Malfunction Caused 

 Excessive 

refrigerant. 

  Faulty outdoor unit PCB. 

 
Troubleshooting 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

91 

Malfunction Decision Conditions 
During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal 
DC Peak sensing circuitry. 
 
Malfunction Caused 

  DC current peak due to compressor failure. 

  DC current peak due to defective power transistor(s). 

  DC current peak due to defective outdoor unit PCB. 

  DC current peak due to short circuit. 

 
Troubleshooting 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

92 

 

 

 

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. 

 

 

 

 

1  Unscrew the 10 screws on the Upper and 

Inner Casing and detach them 

 
 
 
 
 
 
 
 
 
 

 

 

 

1  Unscrew the 2 screws on the Control Board 

and open the Control Board Cover. 

 
2  Pull the Control Board down following the 

Slide Guide. 

 
3  Lift the Control Board up from the bottom, 

disengage the Catch holding the Board.