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Pic 1:Use a multimeter to test the 
DC voltage between L2 port and S 
port of outdoor unit. The red pin of 
multimeter connects with L2 port 
while the black pin is for S port. 
When AC is normal running, the 
voltage will move alternately 
between positive value and
negative value.
Pic 2: :IPM (For dual/tri-zone)
Self-Check  
Operang