MDV CCA3U-09HRFN1-MC, Service Manual, Page: 132 / 213

129
16.3.14. 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?