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In a consumer cycle, the appliance is indicating F8 E1 (slow/no draining). This is because of wrong signals from the circulation pump read by the control board and interpreted as "water present", when there is no water. During draining (and in fact, there is no water), the failure occurs.
1. Check if drain hose is not closed/clogged
2. Drain pump faulty, harness or wiring faulty, control board faulty
3. If machine is equipped with OWl, issue might be caused by damaged or dirty OWl. Clean the sensor lenses then , if issue is not solved, replace OWI (optical water indicator).
One of the reasons for motor not draining during normal cycle is the check valve is stuck. It is meant to return to normal during drain cycle but close during wash. I think the cancel is resetting it and letting water out.
See this discussion.
If there is any blockage in your diposal, water will comes up to the sink, since it happened to me.
As soon I installed the air gap then it fixed the problem. No air gap, water flowing is slowing down conflicting with timed draining causing this problem.
Let's think of this, if you fill up water in a 1/2 galon milk container, and you try to emty it. If you pull down straightly , it will be slow compared to pull it at an agle to let air going into the opening. The air vent helps water flow better meeting the timed draining.