Carrier 69NT40-561-399 Operation And Service Manual page 74

AL08 HIGH COMPRESSOR PRESSURE RATIO
Cause: Controller detects discharge pressure to suction pressure ratio is too high.
The controller will attempt to correct the situation by restarting the compressor.
Component
AL10 CO SENSOR FAILURE
2
Cause: Alarm 10 is triggered when the C
or if the sensor is out of range.
Component
AL14 PHASE SEQUENCE DETECT FAULT
Cause: Controller is unable to determine the correct phase relationship.
Component
Component
Component
T-365
Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings, refer to MANIFOLD
GAUGE SET
Section
Corrective Action Replace DPT if defective.
O
This is a display alarm and has no associated failure action.
Troubleshooting Refer to eAutoFresh manual.
Corrective Action The alarm is triggered off when voltage is within operating range.
N/A
Troubleshooting Power cycle the unit.
Corrective Action Resetting the unit may correct problem, monitor the unit.
Wiring
Troubleshooting Check unit wiring.
Confirm pressure readings during start-up; suction pressure should
decrease and discharge pressure should increase.
Corrective Action Correct wiring.
Current Sensor
Troubleshooting Check Cd41, right most digit:
If display is 3 or 4 check compressor / sensor wiring.
If display is 5 the current sensor is defective.
Corrective Action Replace current sensor if defective.
7.2.
sensor voltage is operating outside of the 0.9 v to 4.7 v range,
2
4–40