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Water tap means that dishwasher doesn't think it's getting water from your house. The buzzing noise is the electronic water valve trying to open so either you don't have water getting to the dishwasher from your house or the valve on your dishwasher has failed and will need to be replaced. Check the water going to the dishwasher and if it checks good, below is link to the electronic water valve you'd need to order for your model. It's the part that the supply hose from your house connects to under the dishwasher (the part that is humming).
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