Carrier 38QUS012D8S Service Manual page 134

2.4.4.13. J1 Malfunction
Malfunction conditions
Possible causes
J1 displayed
J1 displayed
High temperature protection of
High temperature protection of
condenser
condenser
Is the condenser
Is the condenser
temperature is Higher than
temperature is Higher than
65° C?
65° C?
Yes
Is the outdoor ambient
Is the outdoor ambient
temperature higher than
temperature higher than
50℃?
50℃?
No
Is the outdoor unit ventilation
Is the outdoor unit ventilation
functioning properly?
functioning properly?
Yes
Is the outdoor fan running
Is the outdoor fan running
properly?
properly?
Yes
Is the heat exchanger dirty?
Is the heat exchanger dirty?
No
Replace outdoor main
Replace outdoor main
board. Has the problem
board. Has the problem
been resolved?
been resolved?
No
If the level of refrigerant is not
If the level of refrigerant is not
sufficient, does the system work after
sufficient, does the system work after
refrigerant is added?
refrigerant is added?
No
Check whether the refrigerant
Check whether the refrigerant
system is functioning normally
system is functioning normally
Electrical Control System
When the outdoor pipe temperature is more than 65°C, the unit stops. It
starts again only when the outdoor pipe temperature is less than 52°C.
Faulty condenser temperature sensor
●
Dirty heat exchanger
●
System leakage or blockages
●
No
Yes Stop the unit
Stop the unit
Ensure that the outdoor unit
Ensure that the outdoor unit
No
ventilate is functioning properly
ventilate is functioning properly
Refer to the solution to the
Refer to the solution to the
malfunction of fan speed being out of
malfunction of fan speed being out of
No
control . Find the cause and resolve the
control . Find the cause and resolve the
problem.
problem.
Yes
Clean the heat exchanger
Clean the heat exchanger
Is the connection between
Is the connection between
temperature sensor and
temperature sensor and
PCB in working order?
PCB in working order?
Yes
Is the resistance of
Is the resistance of
condenser temp. sensor
condenser temp. sensor
No
normal according to
normal according to
Appendix 1
Appendix 1
Yes
Troubleshooting
No Correct the connection
Correct the connection
Replace the temperature sensor
Replace the temperature sensor
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