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Can you tell me what the noise sounds like? And is the noise only occurring when the dishwasher is running or is it all the time?
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Without being there to hear the noise I really couldn't say for certain what the noise is. There are only 3 options, either a bad control board, a bad vent motor, or a bad dispenser. Depending on where the noise is coming from would tell you what needs to be replaced. Listen near the dispenser and if the dispenser is making noise then replace the dispenser. If the noise coming from the upper right hand corner, you need a new control board. And if the noise is in the upper left hand corner, you need a new vent motor.
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