730 StarCool Alarm Codes And Actions

730 RH sensor missing
Description RH sensor communication missing
Cause Indication of defective RH sensor, or lack of or improper connection
Trouble
shooting		 Possible causes:
  • Communication with RH sensor broken.
  • Defective RH sensor.
  • X10 cable is defective.
  • Main controller defective.
  • CO2 sensor defective (for some models).
  • O2 sensor defective (for some models).
Accompanied alarms:
  1. AL 302 or one or more AL 9XX may also be active. Trouble shooting: Verify that cable RH-com is mounted correctly (and is not damaged) according to wiring diagram inside the controller cabinet.
  2. Verify that plugs are properly connected.
  3. Verify that there are correct voltages 12 V DC between 1 and 4 on X10 or between 1 and 2 on X73.
  4. If model has CO2 and or O2 sensor, see troubleshooting for AL 740 and or AL 760 in “Operating and service manual Controlled Atmosphere”
  5. Measure with a multimeter that there is a small DC signal between 2 and 3 on X10, and between 2 and 3 on X75.
a) If there is no signal: The main controller is defective and must be replaced.
b) If there is signal: The RH sensor is defective and must be replaced.
Criteria Communication with RH sensor not possible

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