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Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.5 Temperature protection of compressor top (ODU P0)
Temperature protection of
compressor top
Check refrigerant circuit,
such as clogging of
capillary tubes etc.
Properly charge the system
Replace the outdoor main PCB
Replace the protector.
Reconnect and retest.
Are all
connections correct?
Check whether protector is
normal? If protector is normal,
resistance=0
Is the unit properly
charged?
Is there any abnormality of
operation after the system
was charged?
Does the compressor
operate?
NoNo
Yes
No
No
Yes
Yes
No