Carrier Super Inverter Series Service Manual page 80

18.3.3.8 Temperature protection of compressor discharge (ODU P4)
Temperature protection of
Temperature protection of
compressor discharge
compressor discharge
Check whether the
Check whether the
compressor discharge temp. is
compressor discharge temp. is
more than 115°C ?
more than 115°C ?
No
Check whether
Check whether
connection is right between
connection is right between
compressor discharge temp.
compressor discharge temp.
sensor and PCB according
sensor and PCB according
to wiring diagrams?
to wiring diagrams?
Yes
Measure the resistance value
Measure the resistance value
compressor discharge
of
compressor discharge
of
temp. sensor.
If the value is
temp. sensor.
If the value is
is normal refer to
not normal
is normal refer to
not normal
the Appendix 2?
the Appendix 2?
Yes
Replace outdoor main PCB
Replace outdoor main PCB
No
Replace high pressure valve assy
Replace high pressure valve assy
Check whether the
Check whether the
Yes
refrigerant is leak
refrigerant is leak
No
the
the
No
No
Replace the compressor discharge temp. sensor
Replace the compressor discharge temp. sensor
Yes
Correct the wiring connection
Correct the wiring connection
49
Stop leaking and add refrigerant
Stop leaking and add refrigerant