711 StarCool Alarm Codes And Actions

711 Display com (Seen in Star View)
Description Reduced communication with display (Not yet implemented)
Cause Indication of defective display, lack of or improper connection
Trouble
shooting		 Possible causes:
  • Communication with display broken.
  • Defective display.
  • X11 cable is defective.
  • Main controller defective.
Accompanied alarms:
  • AL 710, AL 730 and AL 9XX may also be active.
Trouble shooting:
  1. Verify that cable COM is mounted correctly (and is not damaged) according to wiring diagram inside the controller cabinet. 
  2. Verify that there are correct voltages 12 V DC on wire 1.
  3. Measure with a multimeter that there is a small DC signal on the wires 2 and 3 connector PCB for cable COM.
a) If there is no signal: The main controller is defective. Replace the main controller.
b) If there is signal: The display is defective and must be replaced. If there is no display permanent replacement available, a substitution display can be used for setting values and evaluate the unit’s status.
Criteria Communication via the display is not possible

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