Carrier 40MBFAQ Service Manual page 17

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
Remarks:
• Use a multimeter to test the DC voltage between the 2 port (or S or L2 port) and the 3 port (or N or S port) of the outdoor unit. The red pin
of the multimeter connects with the 2 port (or S or L2 port) while the black pin is for the 3 port (or N or S port).
• When the unit is operating normally, the voltage moves alternately between the positive values and negative values.
• If the outdoor unit malfunctions, the voltage was always the positive value.
• Alternately, if the indoor unit malfunctions, the voltage remains at a fixed value.
• Use a multimeter to test the reactor resistance which does not connect with the capacitor.
• The normal value should be around zero ohm. Otherwise, the reactor must has malfunctioned.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
S and N
L2 and S
2 and 3
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