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Discuss Dishwasher suddenly not draining past the u-bend in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Stand pipe too short but probably that had always been wrong maybe the change is the stack is not ventilated properly. Has someone converted the loft and replaced the vent with an aav? If you remove the trap then you would release positive pressure whereas with the trap in place it could be slowed down by the back pressure enough to go over the top
 

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