When a residential dishwasher starts up, fills with water, and runs through its entire cycle normally but leaves dishes completely dirty, the issue points to a circulation pump failure, a clogged sump filter, or closed water inlet valves. If the circulation motor runs but fails to spin the water through the spray arms under pressure, dishes remain unwashed. You can troubleshoot water circulation easily by listening for the spray arms during a cycle. You can verify that your corrective action is successful when cleaning the fine mesh filter basket, clearing blocked spray arm nozzles, or ensuring the water supply valve is fully open restores powerful water jets that clean dishes thoroughly.
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