956 StarCool Alarm Codes And Actions

956 Temp ref 2 HI
Description Controller Internal Voltage Reference Fault
Cause Indication of controller internal voltage reference fault
Trouble
shooting		 Possible causes:
  • Defective power supply for main controller.
  • Defective main controller.
Accompanied alarms:
  • There may be sensor alarms.
  • AL 801 will be activated during FT- or PTI test.
Trouble shooting:
  1. Check if there are other active (sensor) alarms. Clear these alarms fi rst using their trouble shooting.
  2. Check voltage level of 24V DC and 5V signals to see if power supply has an open circuit or other damages. If voltages are ok, the main controller is defective.
Replace main controller.
Criteria Reference voltage 2 above 3.40V DC

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