Carrier 69NT40-541-505 Operation And Service Manual

4–31 T-3684.11 CONTROLLER ALARM INDICATIONSAL05 MANUAL DEFROST SWITCH FAILURECause: Controller has detected continuous Manual Defrost Switch activity for five minutes or more.Component KeypadTroubleshooting Power cycle the unit.Corrective Action Resetting the unit may correct problem, monitor the unit.If the alarm reappears after 5 minutes replace the keypad.AL06 KEYPAD OR KEYPAD HARNESS FAILCause: Controller has detected one of the keypad keys is continuously activity.Component Keypad or HarnessTroubleshooting Power cycle the unit.Corrective Action Resetting the unit may correct problem, monitor the unit.If the alarm reappears replace the keypad and harness.AL07 FRESH AIR VENT OPEN WITH FROZEN SET POINTCause: The VPS is reading greater than 0 CMH while unit is in frozen mode.Component Vent Position Sensor (VPS)Troubleshooting Manually reposition vent and confirm using Cd45. Refer to VENT POSI-TION SENSOR SERVICE Section 7.22.Corrective Action If unable to obtain zero reading, replace defective VPS.AL10 CO 2 SENSOR FAILURECause: Alarm 10 is triggered when the CO2 sensor voltage is operating outside of the 0.9 v to 4.7 v range,or if the sensor is out of range.Component 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.AL11 EVAPORATOR FAN 1 IPCause: Alarm 11 is triggered when configured for single evap operation and MC6 sensed high.Component Evaporator Fan 1Troubleshooting The unit will suspend probe check diagnostic logic and disable the probecheck portion of defrost cycle.Corrective Action AL11 is triggered off when MC6 sensed low.Downloaded from ManualsNet.com search engine