MrCool DIY-MULTI2-18HP230C, Service Manual

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 Troubleshooting 42 
8.10 (ODU)PC 06(Temperature protection of compressor discharge diagnosis and solution)
Description : When the compressor discharge temperature (T5) is more than 115
o
C for 10 seconds, the compressor
ceases operation and does not restart until T5 is less than 90
o
C
Recommended parts to prepare:
• Connection wires
• Outdoor PCB
• Discharge temperature sensor
• Refrigerant
Troubleshooting and repair:
Temperature protection of compressor
discharge
Temperature protection of compressor
discharge
Check whether the
compressor discharge temp.
is more than 115°C ?
Check whether the
compressor discharge temp.
is more than 115°C ?
Check whether the
connection is right between
compressor discharge temp.
sensor and PCB according to
wiring diagrams?
Check whether the
connection is right between
compressor discharge temp.
sensor and PCB according to
wiring diagrams?
Measure the resistance value
of compressor discharge
temp. sensor. If the value is
not normal is normal refer to
the Appendix?
Measure the resistance value
of compressor discharge
temp. sensor. If the value is
not normal is normal refer to
the Appendix?
No
Yes
Yes
No
Correct the wiring connection
Correct the wiring connection
Stop leaking and add refrigerant
Stop leaking and add refrigerant
Replace the compressor discharge temp. sensor
Replace the compressor discharge temp. sensor No
Yes
Replace high pressure valve assy
Replace high pressure valve assy
Yes
No
Replace outdoor main PCB
Replace outdoor main PCB
No
Check whether the
refrigerant is leak
Check whether the
refrigerant is leak