The part(s) or condition(s) listed below for the symptom Dishwasher making noise are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
First, check the drain pump to ensure that it is clear of debris. If the drain pump is clean but it is still noisy, replace it.
Part of the pump and motor assembly (such as the motor bearings, drain impeller, or wash impeller) might be defective. Often, you can replace the pump’s individual parts. However, if you do not want to disassemble the pump to replace its parts, or if the parts are not available separately, you can replace the entire pump and motor assembly.
The water inlet valve opens to allow water to enter the dishwasher. When it is new, the water inlet valve is very quiet during operation. Over time, the diaphragm inside the valve deteriorates and deforms. This deformation interacts with the water rushing in and can produce a loud vibration, buzzing, squealing, or other noises. If the dishwasher is loud during the filling cycle, replacing the water inlet valve may solve the problem.