Trae for Model Number WDT780SAEM1 Dark residue/dust/film increasingly present even after thoroughly cleaning all interior parts of the dishwasher. even lightly soiled dishes are not getting cleaned. Metal cookie sheets are not being used. Fill and drain functions work correctly. City water. The circulation pump works. No obstructions or debris detected in tubing or wash arms and no parts are visibly compromised. i've tried numerous setting combinations as well as detergents and washer citric cleaning products. problem started a few months ago. everything appears to be working as designed. at this point i'm leaning towards the pump and wash arms being ineffective and poorly designed. they work but i can't confirm they work well. i hear the wash arms spraying and rotating during the cycle however, the soap never seems to be 100%, thoroughly dissolved and the dark dust is just baffling.
Answer Trae, oftentimes, dish soap will accumulate throughout the unit and needs to be cleaned using Affresh W10282479 during an empty normal cycle. Sometimes this will need to be repeated two or three times depending on how long it has been since the last cleaning cycle. If this has been done already, the next step would be to identify if the drain hose is allowing any backflow from the drain pipe. This can be done by removing the filter and soaking up any water in the sump (or use a wet-vac) and allow the sink to run for a couple of minutes. If water goes back into the sump, the drain hose will need to have the end going into the drain pipe looped so that part of it is elevated above where the drain hose connects in. Read More... Answered by AppliancePartsPros.com | Friday, July 3, 2020