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Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.4 Temperature protection of compressor discharge (ODU P0)
Temperature protection of
compressor discharge
Check whether the
compressor discharge temp.
is more than 239°F (115°C)?
Check whether there is
a refrigerant leak
Yes
No
Check whether the
resistance of compressor
discharge temp. sensor is
right refer to the Appendix 2
The discharge temp.
sensor may be
broken.
Check whether the wiring
connection is correct between
compressor discharge temp.
sensor and PCB according to
wiring diagram?
Correct the wiring connection
Replace the compressor discharge temp. sensor
Replace outdoor main board
Stop leak and add refrigerant as needed
Yes
No
No
YesYes