Carrier 69NT40-541-505, Operation And Service Manual, Page: 69 / 143

4–39 T-368
AL70 SECONDARY SUPPLY SENSOR (SRS)
Cause: Secondary Supply Sensor (SRS) is out of range.
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
Section 7.21 .
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 Tem-
perature Sensor Service
Section 7.21 .
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, re sets the timers
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