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Service Manual VMH SERIES Heat Controller, Inc.
37
9.2.3 Zero crossing check resistance or inverter compressor, it is .7Ω error
Alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main control
board must have fault.
Is the fan motor connector and
connection good?
Turn off the unit, rotate the
cross fan. Does it rotate
N
Disassemble the connection
between fan and motor, check
bearing. If bad, change the
bearing. If ok, follow the below
Yes
No
Yes
Is voltage being applied to the
fan motor?
Yes
Shut off the power supply and turn on it
Replace the fan motor
Replace the PCB
E3: INDOOR OR E7 OUTDOOR
9.2.4 Fan speed has been out of control diagnosis
The unit does not work normally
E2:
Check power supply and
connections
Indoor PCB defective
Correct power supply or
correct connections
No
Turn off the power supply for 5
seconds, then turn it back on.
Yes
No