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Hi my name is Robert.......
This could be a bad micro switch or the plastic housing that attaches to the motor may be cracked, if this is a 2016 it should be under warranty so that is something to consider, there are some U-tube videos out on how to repair the plastic housing if it is cracked but the machine will have to be taken apart, click HERE to view. IF it is under a year old then I would see if it can be replaced under warranty. Another thing to try is fill it up with some water and vinegar and let it sit, sometimes the vinegar will help clean everything 1 part vinegar to 5 parts water is what Dometic recommends. Hope this helps some.... Robert