421 StarCool Alarm Codes And Actions

421  Over current
Description I1-2 and I1-3 and I2-3 over current
Cause Indication of short circuit in electric installations of Star Cool unit
Trouble
shooting		 Possible causes:

  • The unit is using too much power on one phase.
  • Defective Power module PCB

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the controller.
  2. The voltage may have been too low for too long.
  3. Check power cables for short circuits and damages.
  4. Check cables for heaters and motors for short circuits and damages.
  5. Measure the actual current and compare with the value in the display. If the measurement differs, the power module PCB may be defective. Replace or bypass power module PCB by pressing (spaner icon) selecting configuration then phase direction and then cw. If condenser fan rotates in the wrong direction, choose ccw. This action is to be performed at every unit start up
Criteria Value above upper alarm limit 20 Amp
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