38MHRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
35
DIAGNOSIS AND SOLUTION (CONT)
A210524
Fig. 40 —Test the DC Voltage
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.
A210525
Fig. 41 —Test the Reactor Resistance
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.
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