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4–31
T-368
4.11 CONTROLLER ALARM INDICATIONS
AL05
MANUAL DEFROST SWITCH FAILURE
Cause:
Controller has detected continuous Manual Defrost Switch activity for five minutes or more.
Component
Keypad
Troubleshooting
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 FAIL
Cause:
Controller has detected one of the keypad keys is continuously activity.
Component
Keypad or Harness
Troubleshooting
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 POINT
Cause:
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
.
Corrective Action
If unable to obtain zero reading, replace defective VPS.
AL10
CO
2
SENSOR FAILURE
Cause:
Alarm 10 is triggered when the CO
2
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 IP
Cause:
Alarm 11 is triggered when configured for single evap operation and MC6 sensed high.
Component
Evaporator Fan 1
Troubleshooting
The unit will suspend probe check diagnostic logic and disable the probe
check portion of defrost cycle.
Corrective Action
AL11 is triggered off when MC6 sensed low.
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