Midea MCH4U-36PHH2 - Page 45

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Pic 1: Use a multimeter to test the
DC voltage between 2(old: L2) port
and S port of outdoor unit. The red
pin of multimeter connects with 2
(old: L2) port while the black pin is
for S port.
When AC is normal running, the
voltage will move alternately
between positive value and
negative value.