621 StarCool Alarm Codes And Actions

621 Cpr restarted
Description The compressor has been restarted
Cause No signal from FC that motor is running
Trouble
shooting		 Possible causes:
  • Too high discharge pressure at start up, unit will restart after a delay.
  • Unit in emergency mode, but cables not rewired for emergency mode.
  • Compressor defective.
Accompanied alarms:
  • There may be other alarms, ex. AL 306.
Trouble shooting:
  1. Check and clear AL 306 first (high pressure alarm).
  2. The discharge pressure is too high at start up, unit will restart after a delay.
  3. Check and clear AL 5XX (FC) alarms first.
  4. Check wiring for the compressor motor, especially if unit is in emergency mode.
  5. If this alarm remains active after several restarts, the compressor is defective and should be replaced.
Criteria The compressor did not start on the first attempt within 3 min.

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