My dishwasher washes and drains fine, but when left sitting for a couple of days, dirty water backs up into it. I have tried cutting off the fresh water supply and cutting off the power when not in use. When the unit is turned on, the dirty water is quickly pumped out.
What can I do to prevent water backing up into unit?
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The problem could be the pump, the drain hose or the timer. It will not drain if left to sit. The thing to try first is to put a cup of white vinegar in the machine and let it wash. This may remove sludge or scale blocking the strainer. 2nd take the hose loose at the sink drain and see if it is half clogged with grease or food. Check the hose and the nipple. Last, if it does not work take the bottom off the dishwasher. 4 screws and a plate. look for the pump and see if the hoses are clear. Sears will sell you a manual to repair and test this machine at its Parts Central on line
if there is still water in the dishwasher take the drain hose off from under the sink and use a large pot or mop bucket and but the unit into a drain mode usually by cancelling the wash cycle if the unit still does not drain.Then use a wet dry shop vac and attach it to the end of the drain hose to remove the water
after the water is gone check the drain pump for any kind of obstructions you may need to replace the drain pump
My husband and son actually fixed it and proceeded to do the Happy Handyman dance all over the kitchen. They took off the kickplate on the front, and cleaned out the hose, then took off the sprayer in the center of the unit and cleaned it out too.....lettuce, a plastic spoon, dog hair and a set of vampire teeth later, and my dishwasher is working like new. Also, I ran a cup of white vinegar through just to get rid of the stink and it worked great!
There is 3 basic problems that will cause a dishwasher to not clean the dishes. You can check these problems and see if any will solve your problems.
1: If there is water or suds left in the dishwasher after the cycle is complete. This will cause dirty water to be used in the final rinse and the dishes will not get clean.
2: The pump that supplies water to the spray arms is jammed or defective and unable to pump the water properly, thus causing the dishes to remain dirty.
3: Timer, the timer is not allowing the machine to work in the wash cycle.
The solutions for these 3 are as follows.
1: check the drain line for blockage, if you have a disposal make sure it is clear and water flows down the drain properly. If you have suds left in the dishwasher, clean them out and run a couple cycles with not detergent to rinse away the old suds.
2: Look down in the bottom for any obstructions in the pump. Popcorn seeds, broken glass, etc.
3: If the unit is skipping the wash cycle you will most likely need a new timer or control assembly.
Good luck and I really hope this will Fix Ya