Carrier 38MGRBQ18B-3 - DIAGNOSIS AND SOLUTION (CONT); Compressor Discharge Temperature Protection Diagnosis

38MGRBQ: Service Manual
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DIAGNOSIS AND SOLUTION (CONT)
P4/PC 06 (Temperature protection of compressor discharge) diagnosis and solution
Troubleshooting
ERROR CODE
P4/PC 06
MALFUNCTION DECISION
CONDITIONS
When the compressor discharge temperature(T5) is more than 239
F (115 C) for 10 seconds, the
compressor stops and restarts until T5 is less than 194
F (90C)
SUPPOSED CAUSES
Wiring mistake
Refrigerant leak
Faulty discharge temperature sensor
Faulty outdoor PCB
Temperature protection of
compressor discharge
Check whether the
compressor discharge temp. is
high than 239°F (115°C)
Check if the connection between
the compressor discharge
temperature sensor and the PCB
is correct according
to the wiring diagrams.
No
Yes
Yes
No
Correct the wiring connection
Stop the leak and add refrigerant
Replace the compressor discharge temp. sensor No
Yes
Replace high pressure valve assy
Yes
No
Replace outdoor main PCB
No
Check whether the
refrigerant leaks
Measure the resistance value
of the compressor discharge
temperature sensor. If the value
is not normal, refer to Appendix 2.