Behind the 39 dBA rating of the SHE89PW55N is a surprising quantity of material that has nothing to do with washing: matting, blankets and rubber isolators. This is a Benchmark built-under dishwasher with a deep tub for 16 place settings, a stainless front and condensation drying.
Those quiet-making parts are what a rushed or careless repair most often omits, and when they are missing, the dishwasher can pass its vibration into the cabinets around it. A hum you can feel by touching the cabinet door is a typical sign, and it is something we listen for after any repair of this kind.
On visits to Benchmark units, we check whether the isolators are present and intact. We also look at the hinges, since they carry a very heavy insulated door.
Most often a rubber foot or a strip of sound matting never went back in. They keep the machine from touching its cabinet directly, and lacking them the whole carcass acts like a speaker for the pump.
We would say yes. Cleaning is not affected, but anyone who paid for quietness has lost the main reason for the purchase, and a short visit can bring the quiet back.
Not safely. Isolators sit behind panels, and looking means pulling the machine out. Describe the new sound to us instead and we will inspect under the panels.
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