Heat Controller VMH09SC-1 Service Manual page 40

Service Manual
P1:
9.2.7 Over voltage or too low voltage protection diagnosis and solution
Is the power supply good?
Yes
Replace the outdoor e-box.
P2:
9.2.8 High temperature protection of compressor top diagnosis and solution
Does the compressor operate?
Yes
Is refrigerant circulation
Is refrigerant circulation
volume normal?
charge correct?
No,
Charge refrigerant
Is the abnormality the same
after gas charging?
There is a restriction (Such as capillary
or welded points of the pipes.)
VMH SerieS
No
No
Is the connection good?
Yes
Is overload protector normal? Is overload protector
Yes
Replace the outdoor PCB.
39
40
Make sure the power supply is normal.
No
Reconnect and retest
No
Heat Controller, Inc.
Reconnect it
Replace it