T-362 4–30
Table 4–5 Alarm Indications and Descriptions
AL03 Loss of Superheat Control
Cause: Superheat has remained below 1.66°C (3°F) degrees for five minutes continuously while compressor
running. Compressor drawing more than 2.0 amps, compressor pressure ratio is greater than 1.8, and
Electronic Expansion Valve (EEV) is at 0% open.
Component Electronic Expansion Valve (EEV)
Troubleshooting Check the operation of the EEV at code Cd41.
Corrective Action Replace EEV if defective.
Component Evaporator Temperature Sensor(s) ETS & ETS1.
Troubleshooting Verify accuracy of temperature sensors. See Sensor Checkout Procedure
Section 7.29.2.
Corrective Action Replace ETS or ETS1 if defective.
Component Evaporator Fans
Troubleshooting Confirm fans operating properly
Corrective Action Replace fan(s) if defective. See Evaporator Fan Motor Assembly Section 7.17.
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
Cause: For units equipped with XtendFRESH and a Vent Position Sensor (VPS) , the controller will monitor the
manual fresh air opening at a pre-determined time. If during this time the fresh air vent is open and
XtendFRESH is active, an alarm will be generated. If alarm is active, the controller monitors the manual
fresh air once per hour. Upon clearing the alarm, the controller goes back to monitoring at the pre-
determined time.
Component Vent Position Sensor (VPS)
Troubleshooting Manually reposition vent to 0% and confirm at code Cd45. If Cd45 is not reading
0%, perform a calibration of the panel. See VPS Service Section 7.30.
Corrective Action If unable to obtain a zero reading, replace the defective VPS.
If unit is loaded, ensure vent is closed. Note and replace VPS on next PTI. The
alarm will not affect the XtendFRESH system from operating.
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