SG-38MHRC-01 Specifications subject to change without notice. 33
DIAGNOSIS AND SOLUTION (CONT)
Fig. 38 — 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.
Fig. 39 — 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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