Dishwasher keeps running My Dishwasher runs for about 4 hours. It keeps washing, then goes to the rinse and dry cycle.

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I have seen this several times, and all of the times it has a bad control board. usually if you take the control board out, you can see a visibly burnt spot on the back of it wher a connection has melted. Another possible slowrun time problem could be that the water coming into the dishwasher when it fills is not hot. If it isnt hot, it takes the dishwasher longer to heat the water to temp, and therfore it runs longer. Is the water coming out of your tap reasonably hot? if not you may need to turn up your water heater settings. But if nobody has messed with the water heater, or the tap where the dishwasher is attached and the problem just started then thats probably not it. Good Luck!
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