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

Page: 86 / 174

T-365 4–52
NOTICE
If the controller is configured for four probes without a DataCORDER, the DataCORDER alarms
AL70 and AL71 will be processed as Controller alarms AL70 and AL71. Refer to
Table 4–7 .
AL71 SECONDARY RETURN SENSOR (RRS)
Cause: Secondary Return Sensor (RRS) is out of range.
Component Secondary Return Sensor (RRS)
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 .
AL72 CONTROL TEMP OUT OF RANGE
Cause: After the unit goes in-range for 30 minutes then out of range for a continuous 120 minutes.
Component Refrigeration System
Troubleshooting Ensure unit is operating correctly.
Corrective Action Power cycle unit.
Control Temperature is in In-range.
Any Pre-trip mode, resets the timers.
ERR# INTERNAL MICROPROCESSOR FAILURE
Cause: The controller performs self-check routines. If an internal failure occurs, an “ERR” alarm will appear
on the display. This is an indication the controller needs to be replaced.
Error Description
ERR 0-RAM failure Indicates that the controller working memory has failed.
ERR 1-Program Memory
Failure Indicates a problem with the controller program.
ERR 2-Watchdog time-out The controller program has entered a mode whereby the controller
program has stopped executing.
ERR 3-N/A N/A
ERR 4-N/A N/A
ERR 5-A-D failure The controller’s Analog to Digital (A-D) converter has failed.
ERR 6-IO Board failure Internal program/update failure.
ERR 7-Controller failure Internal version/firmware incompatible.
ERR 8-DataCORDER failure Internal DataCORDER memory failure.
ERR 9-Controller failure Internal controller memory failure.