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DIAGNOSIS AND SOLUTION (CONT)
Fig. 17 – DC Voltage Test
Remark
Use a multimeter to test the DC voltage between the outdoor unit's L2 port and S ports (Fig. 16). The red pin of the multimeter connects with
the L2 port while the black pin is for the S port. When the AC is running normally, the voltage moves alternatively between −50V to 50V.
If the outdoor unit has a malfunction, the voltage moves alternatively with a positive value. If the indoor unit has a malfunction, the voltage
has a certain value. Example: 10−13VDC small fluctuating amounts indicates indoor unit malfunction.
Fig. 18 – Reactor Resistance Test
Remark
Use a multimeter to test the reactor resistance that does not connect with the capacitor (Fig. 18). The normal values should be around zero
ohm. Otherwise, the reactor has malfunctioned and needs to be replaced.
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