In a standard residential dishwasher, the single most expensive internal component to replace is typically the main electronic control board (or central processing unit), followed closely by the circulation pump motor assembly. The electronic control board manages all wash cycles, sensor inputs, and relay signals, often costing between one hundred and fifty and three hundred dollars for the part alone, plus professional labor. Similarly, a heavy-duty circulation pump assembly costs between one hundred and fifty and two hundred and fifty dollars. When these major electrical components fail out of warranty, repair costs can approach the price of a modest new machine.
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