Carrier 69NT40-541-505 Operation And Service Manual page 65

AL50
Cause: VPS Sensor out of range.
AL51
Cause: Controller Memory Failure
AL52
Cause: Alarm list queue is full.
AL53
Cause: Battery voltage low
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AIR VENT POSITION SENSOR (VPS)
Component Vent Position Sensor (VPS)
Troubleshooting Make sure VPS is secure.
Corrective Action Manually tighten panel.
Component Vent Position Sensor (VPS)
Troubleshooting If the alarm persists, replace the sensor or the assembly.
Corrective Action Replace VPS.
EEPROM 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), AL51 will be reset.
Component Controller
Troubleshooting Power cycle the unit. If the alarm persists, it indicates defective controller
memory.
Corrective Action Replace defective controller, refer to Controller Service
EEPROM ALARM LIST 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
BATTERY PACK FAILURE
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 batteries sufficiently.
Once fully charged, the alarm will deactivate.
Corrective Action To clear the alarm press ENTER and ALT simultaneously at the startup of
Cd19 (Battery Check).
If alarm persists, replace the battery pack, refer to
Replacement.
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4–35
Section 7.20.
Table 4–6.
Section 7.20.5 Battery
T-368