My quietpower 3 also is not draining completely. It is not a vent problem with my homes drain system. It seems the pump is not staying on for anough time to complete the draining process. Could the sensor turbitity be malfunctioning at the back of the sump?
Gene.[/quote]
Sure as heck I took out the pump and checked both ends and the end at the sump was blocked by debris and wasn’t opening fully! Also found out the draining is a timed event on this model.