Dishwasher Not Cleaning Dishes? Common Causes and Fixes

Nothing defeats the purpose of an automatic dishwasher like having to re-wash dishes by hand. Here are the most common mechanical causes:

- Clogged Spray Arm Orifices: Hard water minerals and food particles get lodged inside the tiny spray holes of upper and lower spray arms, stopping rotation and water pressure. - Blocked Sump Filter: Modern energy-efficient dishwashers use fine mesh filters instead of noisy macerator blades. If not cleaned monthly, trapped grease recirculates onto your glassware. - Weak Wash Circulation Pump: If the dishwasher fills with water but you don't hear vigorous sloshing, the circulation motor capacitor or impeller is failing. - Defective Water Inlet Valve: If the valve only lets in half the required water volume, spray arms cannot build sufficient pressure to clean properly.

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