Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
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.
S and N
or
L2 and S
or
2 and 3

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English