Regular maintenance of a dishwasher helps ensure that it will work without problems. However, if it does develop a problem, a few checks and minor repairs can help to fix it. Valve maintenance, interior cleaning, and thorough checks of the water and detergent supplies are great ways to regain good dishwasher performance./
Access the valve by removing the cover on the bottom of the dishwasher. Inspect and clean the inlet valve. Any clogging of the inlet valve means that the unit can't get the water it needs to thoroughly clean dishes.
Wash arms need to spin freely. Check that they are not blocked by spinning them with one finger. If you can't spin them easily, check the holes of the arms for blockages. Food or soap scum can cause obstructions. Ensure that the arms are not broken or cracked.
Remove the filtration system at the bottom of the dishwasher. Check the manual or search online for removal instructions. Scrape off all residue and replace the system.
Improper water temperature affects the cleaning performance of the dishwasher. Ensure that the water from the water heater is between 120 and 150 degrees Fahrenheit by using a candy or a meat thermometer. Run the thermometer under hot water from the outlet nearest to the dishwasher. If the water is too cold or too hot, adjust the water heater accordingly