Carrier 38QUS012D8S Service Manual page 135

2.4.4.14. J2 Malfunction
Malfunction conditions
Possible causes
J2 displayed
J2 displayed
Temperature protection of
Temperature protection of
compressor discharge
compressor discharge
Is the compressor discharge
Is the compressor discharge
temperature more than 115°C
temperature more than 115°C
?
?
No
Are the compressor
Are the compressor
discharge temperature
discharge temperature
sensor and PCB connected
sensor and PCB connected
properly according to the
properly according to the
wiring diagrams?
wiring diagrams?
Yes
Measure the resistance value
Measure the resistance value
of compressor discharge
of compressor discharge
temp. sensor. If the value is
temp. sensor. If the value is
not normal, refer to the
not normal, refer to the
Appendix 2. Does a problem stil
Appendix 2. Does a problem stil
exist?
exist?
Yes
Replace outdoor main PCB.
Replace outdoor main PCB.
Does a problem still exist?
Does a problem still exist?
No
Replace high pressure valve assy
Replace high pressure valve assy
Electrical Control System
When the compressor discharge temperature (T5) is more
than 115℃ for 10 seconds, the compressor will stop
restart until T5 is less than 90℃.
Refrigerant leakage
●
Wiring mistake
●
Faulty discharge temperature sensor
●
Faulty outdoor PCB
●
Yes
Is refrigerant leaking?
Is refrigerant leaking?
No
No
Correct the wiring connection
Correct the wiring connection
No
Replace the compressor discharge temp. sensor
Replace the compressor discharge temp. sensor
Yes
Stop the leak and add refrigerant
Stop the leak and add refrigerant
Troubleshooting
and not
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