OT help, dishwasher. Works fine and does NOT overflow, but

There should be a screen in the bottom that catches a bunch of crap from inside. Check that, it could be blocking the drainage. If not, then you may have a clogged drain pipe I would guess.

Tell your wife she should replace her tampon every so often.

Or clogged pump

You may have heavy water.

Someone forgot to knock out the plug on the return

Remove the flexible hose and try to put your finger in the hole, you won't be able to

Put a screw driver in there and tap with a hammer until plug is freed

It's been working for 3 yrs. I understand about the drain pipe, but would that make it "overflow" on the next cycle? Somehow it would have the same level of water in the bottom if I ran another cycle.

How does it drain at all. Also, there is a "drain" button. Light comes on, water still there after.

Screen is clean (now)

Also should be a check valve inline to prevent backflow.

Get a new dishwasher. They're cheap enough just to toss the old one out. Head down to Home Depot and look around. There are all kinds of dishwashers just standing around outside to pick from.

That sucks, you need to figure out if it's a plumbing problem or mechanical. A new dishwasher might be cheaper than a plumber who tells you to replace the dishwasher.

Tried Draino yet?

That's what I'd do but I don't know much about dishwashers. It might be a horrible idea, but new dishwashers are cheaper than plumbers that tell you to buy a new dishwasher anyway lol.