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

Page: 82 / 174

T-365 4–48
AL51 EEPROM FAILURE
Cause: Controller Memory Failure
Component Controller
Troubleshooting Pressing the ENTER key when “CLEAr” is displayed will result in an
attempt to clear the alarm.
Corrective Action If action is successful (all alarms are inactive), alarm 51 will be reset.
Troubleshooting Power cycle the unit. If the alarm persists, it indicates defective con-
troller memory.
Corrective Action Replace defective controller, refer to Controller Service Section 7.24
AL52 EEPROM ALARM LIST FULL
Cause: Alarm list queue is full.
Component Active Alarms
Troubleshooting Repair any alarms in the queue that are active. Indicated by “AA”.
Corrective Action Clear alarms, refer to CONTROLLER ALARMS Section 4.6 .
AL53 BATTERY PACK FAILURE
Cause: Battery voltage low
Component Battery
Troubleshooting If this alarm occurs on start up, allow a unit fitted with rechargeable
batteries to operate for up to 24 hours to charge rechargeable batter-
ies sufficiently. Once fully charged, the alarm will deactivate.
Corrective Action To clear the alarm press ENTER and ALT simultaneously at the start-
up of Cd19 (Battery Check).
If alarm persists, replace the battery pack, refer to
Section 7.24.6
Battery Replacement.
AL54 PRIMARY SUPPLY SENSOR (STS)
Cause: Invalid Supply Temperature Sensor (STS) reading.
Component Supply Temperature Sensor (STS)
Troubleshooting Perform Pre-trip P5: If P5 passes, no further action is required.
Corrective Action If P5 fails, replace the defective sensor as determined by P5, refer to
TEMPERATURE SENSOR Service
Section 7.25 .
AL56 PRIMARY RETURN SENSOR (RTS)
Cause: Invalid Return Temperature Sensor (RTS) reading.
Component Return Temperature Sensor (RTS)
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 .