High Temperature Protection Of Condenser Error (P5) - Carrier 38MGR Series Service Manual

DIAGNOSIS AND SOLUTION (CONT)

High temperature protection of condenser error (P5)

ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Condenser High Temperature Protection
Check if the condenser temp.
is higher than 149°F.
Yes
Check if the outdoor ambient
temp. is higher than 122°F.
No
Check if the outdoor unit
ventilation is good.
Yes
Check if the outdoor fan
runs properly.
Yes
Check if the heat exchanger is dirty.
No
Replace the outdoor main board.
No
Refrigerant is low. Add refrigerant.
No
Check if the refrigerant system is ok.
38MGR-04SM
P5
When the outdoor pipe temperature is more than 149°F, the unit stops, and unit runs again when the
outdoor pipe temperature is less than 125°F
• The condenser temperature sensor faulty
• Heat exchanger dirty
• System block
No
Yes
Stop the unit.
No Restore good ventilation.
Refer to the Fan Speed Out of Control
No
malfunction solution.
Identify the cause and resolve it.
Yes Clean the heat exchanger.
Specifications subject to change without notice.
Check the
connection between
the temperature sensor
and PCB.
Yes
Check if the
Check whether the
condenser temp.
No
sensor resistance is normal.
Refer to Appendix 1.
re 1
.
Yes
Correct the connection.
No
Replace the temperature sensor.
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