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Service Manual VMH SerieS Heat Controller, Inc.
9.3.1.3 Zero-crossing signal error
Check if the connections and
power supply is normal?
Correct the connections. Turn on the
unit when the power supply is good.
No
Yes
Indoor PCB is defective.
Replace indoor PCB.
9.3.1.4 Indoor fan speed has been out of control(DC fan motor)
Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
The unit operates normally.
Replace indoor fan
motor.
Check the wires of fan motor.
Are all the connections good?
No
Yes
No
Correct the connections.
No
Yes
Replace indoor main PCB. Is it
still displaying the error code?
Yes
Yes
Check the voltage between port
1 and 6 of fan motor connector,
is it 310V?
No
DC motor voltage input and output
NO. Color Signal Voltage
1 Red VDC 310V
2 --- --- ---
3 White Vcc 15V
4 Blue FG 0.3V
5 Yellow Vsp 0-7.5V
6 Black GND 0V
5
4
6
3
2
1
Correct the connections. Turn on the unit
when the power supply is within 90-110% of
rated voltage on unit’s rating plate.
Correct the connections
per wiring diagram.
Shut off the power supply, rotate the fan
by hand. Does it rotate freely with any
rubbing/obstructions?
The unit operates normally.
No
are normal?