Poor wash performance - spray action not energetic enough
After 7 years of use, our Maytag MDB7130 is showing poor wash performance because the water is NOT being sprayed energetically enough. I cleaned screens and that certainly restored performance for a while but now I need to clean screens more and more often. Now only 2 days since screens cleaned and washing performance is just abysmal. Plenty of nice hot water in tub, just doesn't splash as hard as before, e.g. the soap in the dispenser isn't even getting exposed to the water! Going to pull arm and filter cover off and clean again but I may have to disassemble even farther. Any ideas?
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All of the water coming to the upper spray arm comes through the feed tube. If the feed tube is blocked or the probe flapper is hung open, water will not flow properly to the upper spray arm. Be sure that when you push in the upper rack the manifold probe is in position in the feed tube. Try adding more water in the tub to see if the upper spray arm starts rotating. Other possibilities; low water charge, cracked spray arm & poor wash pump performance.
Probably a blocked spray arm. Remove the top spray arm and check and clean all the holes as this is where the water sprays out from to clean the dishes and glasses. When they are blocked you get poor wash results. Yes there will also be a filter in the base of the unit to clean. This needs to be done regularly to avoid food getting into the working parts of the unit.
I believe there is a screen/filter on the water line before or at the water fill valve. If that gets plugged it can restrict the flow. The fill valve can also fail/get plugged and restrict the flow.
Also, dishwashers usually have a level sensor to tell when there is enough water to do the wash. It may be a float inside the tub that operates a mechanical switch or it may have a hose to a pressure sensor. Either type can get greasy/dirty/plugged and as a result cause improper water levels.
Check both the water supply filter/fill valve and the level sensor. One or both of those may be involved.
A common cause of poor washing is improper loading—dishes block or impede the spray arms or prevent the soap dispenser from opening. On the other hand, if your dishwasher has chronic problems with washing, the problem may not be your dishwasher. Your home's water pressure may be too low, the water may be too hard, you may not be using the right amount of detergent, or the water temperature may not be hot enough