Quiet Partner II Suddenly Began Making LOUD Noise

We have a Whirlpool Quiet partner II that has been working fine until (and quite suddenly) it began making a very LOUD noise. It sounded as if something might have been stuck inside or perhaps a fan belt is broken or off kilter? I’m not sure as I have never had this issue before this began acting up.

When I turn it on, it runs for a little while to get water inside and THEN it begins to make a horrific sound (scares the cats). I’ve never tried to fix it before, but am willing ti give it a go. Please, can you help?

Many thanks