Bosch Dishwasher: Making Loud Noise
Commonly a worn wash-pump bearing, a cracked spray arm, or debris in the chopper area. Add a photo of your Bosch Dishwasher in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Note what the noise sounds like and when it happens, then turn the dishwasher off and switch off its breaker.
Take a photo of the dishwasher and any code on the display, without opening anything.
If you can read its label without moving it, note the brand and model number for the call.
Everything else about this problem
Is it an emergency?
Is a loud noise from a Bosch dishwasher an emergency?
Usually not an emergency. A grinding, rattling or humming that has just started most often comes from a fan, motor, belt or loose panel. Stop using it and cut the power if the noise comes with a burning smell, smoke or sparks.
Symptoms & causes
Loud noises like grinding or humming often indicate a problem with your Bosch dishwasher's drain pump or circulation pump. Rattling or clunking sounds might point to loose items, a failing spray arm, or a foreign object caught in the impeller. A high-pitched squeal could suggest a worn circulation pump motor bearing, while a loud buzzing often signals a failing drain pump.
Tools & parts
You'll need basic hand tools like a screwdriver set, pliers, and a flashlight to access internal components. Specific replacement parts might include a Bosch drain pump or a new circulation pump assembly. If the issue is a spray arm, a replacement Bosch lower or upper spray arm or an impeller kit for the pump may be needed.
Safety first
Always disconnect the dishwasher's power supply by unplugging it or flipping the circuit breaker before beginning any inspection or repair. Shut off the water supply valve to the dishwasher to prevent leaks or flooding during component removal. Be cautious of sharp edges inside the dishwasher and potential residual hot water, wearing gloves is recommended.
When to call a pro
If the circulation pump motor itself is seized or requires a complex replacement involving specialized tools, it's best to call a professional technician. Persistent error codes that don't clear after basic troubleshooting, especially those related to the main control board, often indicate a need for expert tests. Any issues involving leaks from the main tub seal or internal plumbing that are difficult to access or track down should also prompt a service call.
Questions people ask
Why is my Bosch dishwasher making a grinding noise?
A grinding noise often indicates a foreign object caught in the drain pump impeller or a failing drain pump motor. Inspect the pump area for debris and clear any obstructions.
What causes a humming sound in a Bosch dishwasher?
A humming sound typically points to the drain pump struggling to operate, possibly due to a blockage or an electrical issue. It could also be the circulation pump motor attempting to start but failing.
My Bosch dishwasher is rattling, what should I check?
Rattling can be caused by loose items inside the dishwasher, such as cutlery or dishes hitting the spray arms. Ensure all items are securely placed and check the spray arms for cracks or dislodged parts.
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What it is, how urgent, who to call
Add a photo of your Bosch Dishwasher in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.