Carrier 69NT40-561-300, Operation And Service Manual

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T-365 4–50
AL61 HEATER CURRENT DRAW FAULT
Cause: Improper current draw during heat or defrost mode.
Component Heater(s)
Troubleshooting While in heat or defrost mode, check for proper current draw at heat-
er contactors, refer to ELECTRICAL DATA
Section 3.3 .
Corrective Action Replace heater(s) if defective, refer to Section 7.13.2 Evaporator
Heater Removal and Replacement.
Component Contactor
Troubleshooting Check voltage at heater contactor on the heater side. If no voltage
present:
Corrective Action Replace heater contactor if defective.
AL63 CURRENT LIMIT
Cause: Unit operating above current limit.
Component Refrigeration System
Troubleshooting Check unit for air flow restrictions.
Corrective Action Clean or remove any debris from coils.
Troubleshooting Check unit for proper operation.
Corrective Action Repair as needed.
Component Power supply
Troubleshooting Confirm supply voltage/frequency is within specification and bal-
anced according to ELECTRICAL DATA
Section 3.3 .
Corrective Action Correct power supply.
Component Current limit set too low.
Troubleshooting Check current limit setting Code Cd32.
Corrective Action The current limit can be raised (maximum of 23 amps) using Cd32.
AL64 DISCHARGE TEMPERATURE SENSOR (CPDS)
Cause: Discharge Temperature sensor out of range.
Component Discharge temperature sensor (CPDS).
Troubleshooting Test the CPDS; refer to Sensor Checkout Procedure, Section
7.25.1 .
Corrective Action Replace the CPDS if defective, refer to Sensor Replacement Sec-
tion 7.25 .