38MARB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
29
DIAGNOSIS AND SOLUTION (CONT)
Remarks:
• Use a multimeter to test the DC voltage between the 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) the unit is normal running, the
voltage is moving alternately as positive values and negative values
• If the outdoor unit has malfunction, the voltage will remain in a narrow positive value.
• While if the indoor unit has malfunction, the voltage will be a fixed value.
• Use a multimeter to test the reactor’s resistance which does not connect with capacitor.
• The normal value should be around zero ohm. Otherwise, the reactor must have malfunction. Check the reactor and make sure it is not shorted to
ground.
L2 and S
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