Heat Controller VMH C Series Service Manual page 36

Service Manual
9.2.3 Fan speed has been out of control
Shut off the power supply and turn on 5 seconds later
Turn off the unit, rotate the cross
fan. Does it rotate freely?
Is the fan motor connector and
connection good?
Is the voltage being applied to the
fan motor?
Replace the PCB
9.2.4 Open or short circuit of temperature sensor diagnosis and solution.
Check the connections between the sensors
and the PCB. Are the connections good?
Replace the sensor and check if
the errors happen again?
VMH 30, 36 SerieS
The unit does not work normally
Yes
Yes
No
Yes
No
Disassemble the connection between
fan and motor, check if the left bearing is
normal. If not, change the bearing. If
yes, follow the below step.
Yes
Replace the fan motor
Yes
Replace outdoor PCB
36
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Heat Controller