On ApplianceParts website, for the problem I had, several possibilities were mentioned along with the percentage of times a specific replacement part fixed the problem. The two with the highest percentage were 1) coupler 2) motor. I ordered both since the coupler was very inexpensive. Bottom line, the motor was bad. Be careful to line up 'the key' on the coupler BEFORE pushing down to seat. I pushed down & split the new coupler. Installed the old coupler with the new motor, now it works like a champ.