Dishwater goes from sink to bottom of dishwater

Check the drain for a blockage.

You need to mount the drain hose up; i.e have a portion of it that is higher than the bottom of your sink so water can't backwash into the dishwasher. Although most (all?) dishwashers have a check valve that is supposed to stop this, sometimes, after years of use, that check-valve doesn't work 100%, and water can leak by it. By mounting the drain hose up, it will help prevent this problem.

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What is the make and model number

Check that your supply faucet is open, Check if there is a screen in the supply line, these can become blocked due to scale deposits from the mains. If there is no screen check that the inlet solenoid valve has not got blocked. If none of the above help, check that there is power getting to the solenoid valve when the machine is supposed to be on the fill cycle. If no power is betting to the valve, the timer might ba faulty. (You can try hand filling the machine and see if it goes through a cycle, at least up to the rinse stage, this will tell you if the timer control is working).
If you feel that there is water not being pumped out, remove the bottom strainers and make sure that there is nothing obstructing the outlet pipe and the pump. If possible back flush through the outlet pipe and try draining the machine again before using it again.

Use plughole or sink unblocker in a dishwater very sparingly and ideally not at all. It contains caustic soda which can be highly dangerous if not used correctly.. Double rinse afterwards to get rid of the clorine. If the plughole unblocker doesn't do the trick get someone in fast as caustic soda when it reaches a certain temperature is highly corrosive. Clean and wash hands a few times as well.

Hello- Find drain hose from dishwasher under sink. Should have gooseneck ~ in hose run to keep water from getting back into dwshr. Does full sink drained all at once push water into tub? Sometimes stuff not disposalled yet blocks drainage. Older motors can tend to become weak with age, not pumping as much water out of tub as it used to.Anyway- Hope this helps- ED

Your dishwasher water fill valve is defective. Remove power from the DW. Remove the bottom toe kick panel. The water valve has the incoming water line connected to it.Remove the wires from the valve. If the water stops entering you have a bad timer. If it makes no difference you have a bad valve. The valve is a replaceable part. The timer is a replaceable part.

check your connections under the sink. A dishwasher (unless it is a commercial one) is not built to heat water the water is supplied via the water heater via the sink angle stop. The dishwasher does however have a heating element inside used to dry the dishes. I would check the hot water side of the sink where the dishwasher is connected to see if the problem could be in that area. Check your setting on the machine. Good Luck on your repairs

Dave

You may be getting sand in from the supply lines. Fill a clear glass container from the sink a few times and look at the bottom for sand particles. You may be getting sand from a pool filter? Remove the filter from the faucet head (it should unscrew) and look for sand particles in it. You may not be getting them in the kitchen sink if the dishwater inlets are below the sink as the particles may be sinking to the bottom of the pipes. You may need to put a filter in the dishwasher inlet. Try filling the dishwasher by hand with bottled water once and then see if the sand is still there. If so, it probably comes in through the water supply.