Carrier 69NT40-561-399 Operation And Service Manual page 86

AL71 SECONDARY RETURN SENSOR (RRS)
Cause: Secondary Return Sensor (RRS) is out of range.
Component
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
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
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
ERR 0-RAM failure
ERR 1-Program Memory
Failure
ERR 2-Watchdog time-out
ERR 3-N/A
ERR 4-N/A
ERR 5-A-D failure
ERR 6-IO Board failure
ERR 7-Controller failure
ERR 8-DataCORDER failure Internal DataCORDER memory failure.
ERR 9-Controller failure
T-365
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
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.
Description
Indicates that the controller working memory has failed.
Indicates a problem with the controller program.
The controller program has entered a mode whereby the controller
program has stopped executing.
N/A
N/A
The controller's Analog to Digital (A-D) converter has failed.
Internal program/update failure.
Internal version/firmware incompatible.
Internal controller memory failure.
4–52
Section 7.25.
Table 4–7.