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

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T-365 4–46
AL25 CONDENSER IP
Cause: Condenser fan motor internal protector (IP) is open.
Component Insufficient Air Flow
Troubleshooting Shut down unit and check condenser fan for obstructions.
Corrective Action Remove obstructions.
Component Condenser Fan Motor
Troubleshooting Shut down unit, disconnect power, & check Condenser Fan Motor IP
at plug connection pins KB5 & KB3.
Corrective Action Replace defective condenser fan motor, refer to Condenser Fan Mo-
tor Assembly Service
Section 7.11 .
AL26 ALL SENSORS FAILURE: SUPPLY/RETURN PROBES
Cause: Sensors out of range.
Component All sensors detected as out of range
Troubleshooting Perform Pre-trip P5:
Corrective Action If P5 passes, no further action is required.
If P5 fails, replace the defective sensor as determined by P5, refer to
TEMPERATURE SENSOR Service
Section 7.25 .
AL27 ANALOG TO DIGITAL ACCURACY FAILURE
Cause: Controller AD converter faulty.
Component Controller
Troubleshooting Power cycle the unit. If the alarm persists, it indicates a defective mi-
croprocessor.
Corrective Action Replace defective microprocessor, refer to Controller Service Sec-
tion 7.24 .