102 StarCool Alarm Codes And Actions

102  Tret invalid
Description Return Air Temperature Sensor Invalid
Cause Indication of defective return air temperature sensor or its measuring circuitry
Trouble
shooting		 Possible causes:

  • Active alarms AL 100, AL 101 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 100 or AL 101 are active, check their trouble shooting section first.
  3. Disconnect the sensor cable for sensor Tret 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 Sensor is defective and the missing sensor reading has been substituted by a value from AAS system. See “6.18 Alarm Action System (AAS)” p. 19
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