My dishwasher makes a grinding noise when it runs. what could be causing that?

No a noise filter is a different kettle of fish. That stops electrical interference noise from affecting your television, radios and electrical devices.

The most likely source of the hum is the start capacitor on the motor, or the motor itself.

https://www.google.com/search?q=samsung+dishwasher+start+capacitor

This has a different idea

Humming or Grinding If your Samsung dishwasher makes noise when starting that sounds like a low hum, it's part of normal function. The motor makes this sound as it operates throughout the wash cycle. However, a dishwasher making loud humming noise or grinding sounds could mean that debris is caught in the drain pump.

Samsung Dishwasher Making Noise? Follow These Tips

This says the drain pump, but the drain pump only runs to empty out so it wouldn't do it all the time.

https://kitchenbuds.com/dishwasher-guides/samsung-dishwasher-making-grinding-noise/

Lots of other ideas and videos

https://www.google.com/search?q=samsung+dishwasher+humming

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Grinding noises can be the pump or grate system that dissolves food chunks. Check the sump area and see if any bones or other hard objects are there. The issue might also be related to a valve noise on the water valve.

How To Fix A Washing Machine Making Noise During The ...

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Dishwasher Making Loud Grinding Noise During Wash Cycle

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Apr 11, 2014 - Dishwasher Making Loud Grinding Noise During Wash Cycle ... GE, Whirlpool, Frigidaire, KitchenAid, Maytag, Kenmore, and LG) this is a .... Our Amana dishwasher is making a loud, high-pitched squealing noise throughout the wash ....Out Of A Washing Machine - Top Load & Front Load September 30, ...

All comments on Loud dishwasher Frigidaire Gallery mode ...

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It sounds like the main circulation water pump bearings are damaged.

Hello friend, thank you for your inquiry!

I understand that your Frigidaire dishwasher is making a grinding noise. Typically that noise could be a faulty motor/pump. I have included a link to your manaul. If that does not help I would recommend having a technician out to your home to properly diagnose and repair your appliance. Best of luck. -Matt
Frigidaire Manual Search Results

The LG does suffer from "poor quality" motor that causes this type of noise. The main motor and pump assembly is common to give this type of problem. The pump seal leaks a small amount of water that gets onto the front bearing and causes a "grinding = humming" noise. This can be easly replaced once you have the bottom off and dishwasher on its door. The motoe has 1 screw in the back holding the motor to the bottom and two rubber seals for the water pump in/out into the washer. Just pull and move motor and pump assmbly and it comes free. Replace with a new motor and pump assembly...

grinding noise normally comes from drain pump or a circulation pump, a tech has to see which one it is .or if you want when it goes in drain mode see if you hear it then,if not then it the other. let me know if i have been of some help.

Is there a chance the dishes are moving when the machine is on? Cound the water jets(spraying the door and sides) be the cause of the noise. Is the sound insulating blanket on the outside of the machine? Try running empty on a shor cycle to help diagnose the problem.

Well done by resolving this problem. The other way to avoid the siphoning problem through the drain hose is adding an air gap valve/connector (available at any hardware store). You can use it even if you don't have a garbage disposal in your kitchen sink. That will assure that you have the proper height of the drain hose.
Hope this helps!

you an remove lower access panel run d/w and nextime it makes the noise grab a flashlight and take a look under. sounds like a vibration issue( especially since you hit it nad it stops) perhaps your copper water line is rattling or your drain line is hitting motor causing noise