129 StarCool Alarm Codes And Actions

129  Tamb invalid
Description Ambient Temperature Sensor Invalid
Cause Indication of defective supply ambient sensor or its measuring circuitry
Trouble
shooting		 Possible causes:

  • Active alarms AL 127, AL 128
  • 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 127 or AL 128 are active, check their trouble shooting section first.
  3. Disconnect the sensor cable for sensor Tamb from the connector on the main controller, according to the wiring schematics inside in the control cabinet.
  4. 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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