![background image](http://html1.mh-extra.com/html/carrier/38qus012d8s/38qus012d8s_service-manual_2560795135.webp)
Troubleshooting
Electrical Control System
133
2.4.4.14. J2 Malfunction
Malfunction conditions
When the compressor discharge temperature (T5) is more
than 115
℃
for 10 seconds, the compressor will stop
and not
restart until T5 is less than 90
℃
.
Possible causes
●
Refrigerant leakage
●
Wiring mistake
●
Faulty discharge temperature sensor
●
Faulty outdoor PCB
J2 displayed
J2 displayed
Temperature protection of
compressor discharge
Temperature protection of
compressor discharge
Is the compressor discharge
temperature more than 115°C
?
Is the compressor discharge
temperature more than 115°C
?
Are
the
compressor
discharge
temperature
sensor and PCB connected
properly according to the
wiring diagrams?
Are
the
compressor
discharge
temperature
sensor and PCB connected
properly according to the
wiring diagrams?
Measure the resistance value
of compressor discharge
temp. sensor. If the value is
not normal
, refer to the
Appendix
2. Does a problem stil
exist?
Measure the resistance value
of compressor discharge
temp. sensor. If the value is
not normal
, refer to the
Appendix
2. Does a problem stil
exist?
No
Yes
Yes
No
Correct the wiring connection
Correct the wiring connection
Stop the leak and add refrigerant
Stop the leak 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.
Does a problem still exist?
Replace outdoor main PCB.
Does a problem still exist?
No
Is refrigerant leaking?
Is refrigerant leaking?
Summary of Contents for 38QUS012D8S
Page 1: ...Contents i Energy Related Products SUPER DC INVERTER SERIES Service Manual...
Page 13: ...Service Space Indoor Units 11 3 Service Space 1000mm 1000mm 1000mm 1000m m Chart 3...
Page 16: ...Air Velocity Distributions Reference Data Indoor Units 14 30 42K Cooling Heating...
Page 17: ...Air Velocity Distributions Reference Data Indoor Units 15 48 55K Cooling Heating...
Page 22: ...Field Wiring Indoor Units 20 10 Field Wiring 42QTD018R8S 42QTD024R8S 42QTD036R8S...
Page 23: ...Field Wiring Indoor Units 21 42QTD048R8S 42QTD060R8S...
Page 29: ...Features Indoor Units 27...
Page 46: ...Service Space Indoor Units 44 3 Service Space...
Page 61: ...Wiring Diagrams Outdoor Units 59 3 Wiring Diagrams 38QUS018R8S...
Page 62: ...Wiring Diagrams Outdoor Units 60 38QUS024R8S...
Page 63: ...Wiring Diagrams Outdoor Units 61 38QUS036R8S...
Page 64: ...Wiring Diagrams Outdoor Units 62 38QUS036R8T...
Page 65: ...Wiring Diagrams Outdoor Units 63 38QUS048R8T 38QUS060R8T...
Page 87: ...Refrigerant pipe installation Installation 85...