I'd suggest using about a 1/4 cup of baking soda and running it empty. I've found baking soda helps with my dishwasher when I start getting standing water. You can also remove the basket and see if there is any small bone or debris clogging the drainage valve.
``It is normal for there to be a small amount of standing water in the dishwasher filter area (about half way up to the top of the filter area). You may notice this water when you remove your dishwasher filters for regular cleaning. The water is there to keep the seals in that area from drying up.
There are a few reasons why your dishwasher won't drain. The most common source of clogs comes from a blockage in the dishwasher's filter. Or, you may have an issue with your dishwasher's air gap, drain valve, drain hose or even your garbage disposal, causing your dishwasher to clog.
reduce the performance level of the appliance and damage dishes and utensils. Note: Never run the dishwasher without the filters in place.
You can manually remove excess standing water by removing the bottom rack and placing absorbent towels on the bottom of your dishwasher to soak up the remaining water. If your dishwasher has standing water due to an interrupted wash cycle, simply run another cycle without interruption.
If the dishwasher is not draining, you may try forcing it. Hold down the “cancel” button for about three seconds, or the time your model's instructions indicate.
Since it is common for debris to get stuck in the dishwasher drain, try cleaning it with a solution of equal parts baking soda and vinegar. Pour the baking soda and vinegar into the bottom of the dishwasher and let it sit for 15 minutes. Then run a rinse cycle at the highest heat setting.
About five seconds after you start running a dishwasher cycle, the drain pump will start making a low humming noise. This will be due to a piece of glass blocking the impeller from turning, resulting in the dishwasher pump not working properly. When this happens, you'll need to remove the blockage.
Attempt a natural fix – you could pour a cup of baking soda followed by a cup of vinegar into the standing water at the bottom of your dishwasher, then leave it for about 20 minutes. If the mixture has started draining, rinse it with some hot water and run the dishwasher's rinse cycle.
Tips to Keep Your Dishwasher Filter Clean Longer
Put two cups of distilled white vinegar in an open container on the top rack. Run a regular hot water wash cycle to complete the cleaning. Avoid placing certain materials in it, including paper labels, wooden spoons, etc., that can easily break off and cause debris.
Inspect and Clean Spray Arms: Occasionally, check the dishwasher's spray arms for clogs or obstructions. If the spray arms are not functioning correctly, it can generate poor cleaning performance and cause more debris to end up in the filter.
Signs you should be cleaning your filter more
Visible build-up of food in the filter. Water not draining properly. Nasty and unpleasant odours.
Keeping your dishwasher filter clean is one key to avoid cloudy glassware and maintain sparkling dishes. Often, clogged filters can cause problems like your dishwasher not cleaning. In fact, the filter is responsible for: Protecting the pump from being clogged by oversized or foreign objects.
The filter unit can be removed by unscrewing the filter cylinder at the base of the dishwasher and lifting the unit out. It can then be cleaned under the tap before being replaced. Before loading dishes into the dishwasher, always ensure that all food debris is scraped off beforehand.
The drain hose helps keep dirty water out of the dishwasher. If there are any kinks or folds (or if it's clogged with food), it can cause standing water. To fix it, you'll need to turn off the power, locate the hose, and check to see that it's not twisted or clogged.
You can also use a plunger to help dislodge any obstructions. If this hasn't helped, then you may need to remove the washing machines drain pipe. Removing the pipe may prove to be quite an undertaking depending on your dishwasher make and model.
Find the filter at the bottom of the dishwasher. It usually looks like a short cylindrical tube. Twist to unlock it and gently remove it from the machine. Some filters have two parts: a cylindrical upper filter and a flat lower filter beneath it.
Whole House Filter Housing Wrench – Opener Tool for 21” Water Filter Canisters (20” Filters) Make your filter changes quicker and easier with a Whole House Water Filter Housing Wrench. The wrench is compatible with all standard whole house filter housings for 3 stage, 2 stage, and 1 stage systems.