Carrier TRANSICOLD PrimeLINE 69NT40-571-001, Operation And Service Manual, Page: 83 / 186

4–47 T-372
Corrective Action
If alarm stays active, replace battery.
AL287 RTC Fault
Cause:
RTC time invalid.
Component Real Time Clock
Troubleshooting
Power cycle. Reset clock. Verify it maintains correct time.
Corrective Action Replace RTC Battery. Retest.
AL289 Data Storage Fault
Cause: Unable to store data in DataCorder.
Component
DataCorder
Troubleshooting Power cycle and verify that the alarm goes inactive.
Corrective Action
If alarm stays active, replace the controller.
AL907 Manual Fresh Air Vent Open
Cause:
For units equipped with EverFRESH and a Vent Position Sensor, the controller will monitor the
manual fresh air opening at a pre-determined time. If during this time the fresh air vent is open and
EverFRESH is active, an alarm will be generated. If an alarm is active, the controller monitors the
manual fresh air once per hour. Upon clearing the alarm, the controller goes back to monitoring at
the pre-determined time.
Component Vent Position Sensor (VPS)
Troubleshooting
Manually reposition vent to 0% and confirm using Cd45. If Cd45 is not
reading 0%, perform a calibration of the panel. See
Section 7.29
for Vent
Position Sensor service procedures.
Corrective Action If unable to obtain a zero reading, replace the defective VPS.
If unit is loaded, ensure vent is closed. Note and replace VPS on next PTI.
The alarm will not affect the EverFRESH system from operating.
AL909 Oxygen Sensor (O2) Fault
Cause:
Triggered anytime the O
2
sensor reading is outside of the normal operation range, after an initial
signal was detected.
Action: Control CO
2
by running the EverFRESH Air Compressor (EAC) and opening the EverFRESH Air
Valve (EA). Controlling CO
2
via the EA will also prevent low O
2
and cargo loss. If both AL909 and
AL910 are active, run the EAC and open the EA.
Component
O
2
Sensor, O
2
Amplifier
Troubleshooting Check Cd44 and scroll down to 02V. The O
2
sensor output will be
displayed in millivolts (130mV to 4100mV is a good range).
Check wiring (refer to schematic), and check for bad connections or wires
improperly positioned.
If O
2
sensor is available, remove the upper fresh air panel and evaporator
motor and replace the sensor. If after replacing the sensor Cd44 reads
outside of the normal range and AL909 continues, replace the amplifier.
If parts are not available, turn the EverFRESH option off via Cd71 and
open the manual fresh air vent.
AL286 RTC Battery Low