Check the track for the slide mechanism. It may be there are some debris that have collected that have been pushed to the rear and have made a resistant to the further movement of the opening. Such a resistant will cause the over pressure switch to disengage the power, therefore stopping the further travel.
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Check the track for the slide mechanism. It may be there are some debris that have collected that have been pushed to the rear and have made a resistant to the further movement of the opening. Such a resistant will cause the over pressure switch to disengage the power, therefore stopping the further travel.