117 StarCool Alarm Codes And Actions

117  Tusda 3 out of range
Description USDA 3 Temperature Sensor Invalid
Cause Indication of defective supply air temperature sensor or its measuring circuitry or sensor not mounted correctly in unit
Trouble
shooting		 Possible causes:

  • Active alarms AL 115, AL 116 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 115 or AL 116 are active, check their trouble shooting section first.
  3. If AL 901 is active, see trouble shooting for AL 901
  4.  Disconnect the sensor cable for sensor Tusda1 from the connector on themain controller, according to the wiring schematics inside in the control cabinet.
  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 Activated by UWS or AL 901
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