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Heat Controller, Inc. VMH SerieS Service Manual
9.3.1.5 Indoor fan speed has been out of control(AC 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 cross
fan by hand. Does it
rotate properly?
The unit operates normally.
Disassembly the
connection between
fan and motor, check if
the bearing is normal?
Replace the bearing.
Check the wires of
fan motor. Are all the
connections good?
No
Yes
No
No
Replace indoor fan motor.
Yes
Correct the connections.
No
No
Yes
Yes
Check the resistance value of
indoor fan motor, is it normal?
Replace indoor PCB.
Yes
freely?
Correct the connections
per wiring diagram.