Carrier 38MHRC Service Manual page 35

38MHRC: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Use a multimeter to test the DC voltage between the outdoor unit's L2 port and S port. The red pin of the multimeter connects with the L2 port while
the black pin is for the S port. When the air conditioner is running normal, the voltage moves alternately between -50V to 50V. If the outdoor unit
malfunctions, the voltage moves alternately with positive value. If the indoor unit malfunctions, the voltage has a certain value.
Use a multimeter to test the resistance of the reactor which does not connect with the capacitor. The normal value should be around zero (0) ohm.
Otherwise, the reactor has a malfunction and needs to be replaced.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 40 —Test the DC Voltage
Fig. 41 —Test the Reactor Resistance
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