303 StarCool Alarm Codes And Actions

303  AirEx invalid
Description Air Exchange Sensor Short Circuit
Cause Indication of a loose connection, defective or lack of air exchange sensor
Trouble
shooting		 Possible causes:

  • AirEx is out of calibration
  • Air exchange sensor AirEx or cable defective.
  • X23 cable is defective.
  • Main controller defective.

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the controller.
  2. If the cable by inspection is defective, replace cable.
  3. Calibrate AirEx see “19. Calibration of air exchange sensor” p. 168 If the value shown in controller is wrong or alarm still active then disconnect the cable for AirEx on the main controller according to the wiring schematics inside the control cabinet and from the AirEx sensor.
  4. Mount the cable for AirEx in controller cabinet and on the sensor. Disconnect signal wire on main controller. Measure voltage between wire and GND on the main controller. If the voltage is over 4.0 V DC, sensor or connection between sensor and cable is defective. If the voltage is between 0.2 V DC and 4.0 V DC, continue to 5).
  5. Mount signal wire. Measure voltage between SIGNAL and GND. If the voltage is between 0.2 V DC and 4.0 V DC and this alarm is still active continue to 6).
  6. Check controller, see “16.1 Trouble shooting for Star Cool main controller” p. 60 before replacing main controller.
Criteria Value above alarm limit 225 m3/hour
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