123 StarCool Alarm Codes And Actions

123  Tevap invalid
Description Evaporator Temperature Sensor Invalid
Cause Indication of defective evaporator temperature sensor or its measuring circuitry
Trouble
shooting		 Possible causes:

  • Active alarms AL 121, AL 122 or AL 901 (if CIM5 software)
  • Temperature sensor reading is out of valid range: -60°C (-76°F) or above +140°C (284°F).

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the controller.
  2. If alarms AL 121 or AL 122 are active, check their trouble shooting section first.
  3. Disconnect the sensor cable for sensor Tevap from the connector on the main controller, according to the wiring schematics inside in the control cabinet.
  4. If AL 901 is active, see trouble shooting for AL 901
  5. Measure the resistance between the two wires.

a) If the resistance is out of range, see “30.2 Temperature Sensor [°C] - Resistance Table” p. 185, the temperature sensor and cable are defective and should be replaced.

b) If the resistance is within range, perform main controller check “16.1 Trouble shooting for Star Cool main controller” p. 60 before replacing main controller.
Criteria Value below alarm limit -60°C (-76°F) or above +140°C (+284°F). Value must be invalid for 30 sec. for alarm activation.
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