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Heat Controller, Inc. VMH SerieS Service Manual
PIC 2, Check the wiring.
PIC4: Main board LED when power on and unit standby.
PIC 5: check point bottom,
press 18 times to
check how many indoor units are
connected.
Pic 1: Measure the voltage of L2 to S (Vs), is it
moving alternately between positive value and
negative value?
PIC 3: IPM (For dual/tri/quad-zone)
PFC (quad-zone only)