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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
.
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
.
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
.
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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