We stand by our 1 year warranty for any controller, pump block or power supply issue.
Check the impellers for snails or debris. Check seals, O-rings and connections for corrosion and damage. Use aquarium safe silicon grease to put it back together for best results.
Be very careful when removing the skimmer collection cup. Be sure to twist all the way and lift only when in the unlocked position. Lifting the cup prior to unlocking will break the locking teeth at the base of the cup.