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HomeRepair HelpDishwasher RepairDishwasher making noise Repair
Dishwasher making noise
If your dishwasher is making noise, start with the parts most likely to cause it. A noisy dishwasher often points to a drain pump clogged with debris or a drain pump that is simply wearing out. Next, check the circulation pump, since worn motor bearings can create a steady humming or droning sound. A broken drain impeller can also cause dishwasher grinding noise or buzzing noise, and damage inside the pump and motor assembly, including bad motor bearings, a worn drain impeller, or a damaged wash impeller, is another common source. The wash impeller itself is worth inspecting because bent, warped, or broken blades can scrape the pump housing and cause a dishwasher loud noise during the wash cycle. On some models, the circulation and drain pump motor bearings can fail and produce the same kind of constant drone. If your dishwasher is making noise, matching the symptom to the right part is the key first step. Enter your model number on RepairClinic.com to find the exact replacement drain pump, circulation pump, drain impeller, wash impeller, pump and motor assembly, or circulation and drain pump motor for your specific dishwasher.
01 - Dishwasher Circulation Pump
The circulation pump motor has bearings that wear out over time. When the motor bearings fail, they generate a continuous drone. If the motor bearings have failed, you must replace the entire circulation pump.
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02 - Dishwasher Pump and Motor Assembly
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.
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03 - Dishwasher Wash Impeller
The wash impeller is a small plastic blade that forces water through the spray arms. If one or more of the impeller blades is broken, the dishwasher will make noise. In addition, if the impeller is damaged, warped, or bent, it can scape against the pump housing. Inspect the wash impeller for damage. If the wash impeller is damaged, replace it. On most models, you can replace the wash impeller independently of the pump and motor assembly. Search for your model number to determine if your impeller is replaceable. If the impeller cannot be replaced separately, you will have to replace the entire pump and motor assembly.
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04 - Dishwasher Drain Pump
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.
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05 - Dishwasher Drain Impeller
The drain impeller pushes water through the drain hose and into the garbage disposer or drain line. If the impeller is broken, replace it.
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06 - Dishwasher Circulation and Drain Pump Motor
The circulation pump motor has bearings that wear out over time. When the motor bearings fail, they generate a continuous drone. If the motor bearings have failed, replace the motor or replace the entire pump and motor assembly.
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07 - Obstructed wash arm
There are several wash arms in a dishwasher, typically one for each rack. If a handle or untensil is sticking through one of the racks the wash arm may be hitting it as it turns. Or there may be an item that is too tall and obstructing the upper wash arm. Confirm that nothing is obstructing the upper or lower wash arms.
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Frequently Asked Questions
Why is my dishwasher making a loud grinding or buzzing noise?
Why does my dishwasher make a constant humming or droning sound during the cycle?
Can a dishwasher drain pump make noise even if the dishwasher still drains?
Should I replace the wash impeller or the whole pump and motor assembly?
How do I find the right dishwasher noise repair part for my model?