Remark: 
Use a multimeter to test the DC 
voltage between 2 port and 3 port of 
outdoor unit. The red pin of 
multimeter connects with 2 port while 
the black pin is for 3 port.   
 
When AC is normal running, the 
voltage will move alternately between 
-50V to 50V. 
 
If the outdoor unit has malfunction, 
the voltage will move alternately with 
positive value.   
 
While if the indoor unit has 
malfunction, the voltage will be a 
certain value. 
Remark,   
The old label is L1,L2,S, L1,L2 
The new label is 1, 2, 3, L1,L2 
 
Remark: 
Use a multimeter to test the 
resistance of the reactor which does 
not connect with capacitor. 
The normal value should be around 
zero ohm. Otherwise, the reactor 
must have malfunction and need to 
be replaced.