Century COMFORT-AIRE VMH-SG Series Service Manual page 89

Service Manual - VMHxxSG
Remarks:
• Use a multimeter to test the DC voltage between 2 port(or S or L2 port) and 3 port(or N or S port) of outdoor unit.
The red pin of multimeter connects with 2 port(or S or L2 port) while the black pin is for 3 port(or N or S port) .
• When AC is normal running, the voltage is moving alternately as positive values and negative values
• If the outdoor unit has malfunction, the voltage has always been the positive value.
• While if the indoor unit has malfunction, the voltage has always been a certain value.
• 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.
Note: The picture and the value are only for reference, actual condition and specific value may vary.
 Troubleshooting 
Troubleshooting
S and N
or
L2 and S
or
2 and 3