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

AL70
Cause: Secondary Supply Sensor (SRS) is out of range.
AL71
Cause: Secondary Return Sensor (RRS) is out of range.
AL72
Cause: After the unit goes in-range for 30 minutes then out of range for a continuous 120 minutes.
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SECONDARY SUPPLY SENSOR (SRS)
Component Secondary Supply Sensor (SRS)
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 Tem-
perature Sensor Service
SECONDARY RETURN SENSOR (RRS)
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 Tem-
perature Sensor Service
CONTROL TEMP OUT OF RANGE
Component Refrigeration System
Troubleshooting Ensure unit is operating correctly.
Corrective Action Power cycle unit.
Control Temperature is in In-range.
Any Pre-trip mode, re sets the timers
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Section 7.21.
Section 7.21.
4–39 T-368