Why Dishwasher Not Cleaning Dishes

Quick answer

A dishwasher that isn't cleaning dishes often has a clogged filter, low water temperature, or faulty detergent dispenser. Check these components first to restore cleaning performance.

Confirm the symptom

• Dishes remain dirty after a full cycle
• Food particles still stuck on plates and utensils
• Water not rinsing off dishes properly
• Dishes look clean but have a film or streaks

Tools and prep

• Screwdriver (flathead and Phillips)
• Soft brush or toothbrush
• Clean cloth or towel
• Replacement detergent or rinse aid
• Rubber gloves
• Bucket (for water collection)
• Turn off power at circuit breaker for safety
• Ensure water supply is accessible

Step-by-step troubleshooting

1. Check Water Temperature
   Do: Verify the water temperature at the dishwasher inlet is at least 120°F (49°C).
   Observe: Cold or lukewarm water.
   Means: Insufficient heat prevents proper cleaning.
   Next: Adjust water heater settings if temperature is too low.
2. Inspect and Clean the Filter
   Do: Locate the filter at the bottom of the dishwasher and remove it. Clean it under running water to remove debris.
   Observe: Clogged or dirty filter.
   Means: A dirty filter restricts water flow and cleaning efficiency.
   Next: Reinstall the filter and run a test cycle.
3. Check Detergent and Dispenser
   Do: Ensure the correct detergent is used and the dispenser is functioning properly.
   Observe: Empty dispenser or clogged dispenser door.
   Means: Improper detergent use or dispenser issues reduce cleaning power.
   Next: Refill the dispenser with appropriate detergent and try a new cycle.
4. Examine Spray Arms
   Do: Remove the lower and upper spray arms. Check for clogs in the spray nozzles using a toothpick or pin.
   Observe: Blocked nozzles or restricted water flow.
   Means: Clogged spray arms prevent water from reaching dishes.
   Next: Clean the nozzles and reattach the spray arms.
5. Verify Rinse Aid Level
   Do: Check the rinse aid dispenser and refill if necessary.
   Observe: Low or empty rinse aid reservoir.
   Means: Lack of rinse aid can cause water spots and poor rinsing.
   Next: Add rinse aid and run a cycle to see if it improves results.
6. Inspect Water Inlet Valve
   Do: Check for a faulty water inlet valve that may not be allowing enough water into the dishwasher.
   Observe: No water entering or low water pressure.
   Means: A faulty valve can lead to insufficient water for cleaning.
   Next: Replace the water inlet valve if it is defective.
7. Check for Proper Loading
   Do: Ensure dishes are loaded correctly, allowing water to reach all surfaces.
   Observe: Overloaded or improperly arranged dishes.
   Means: Poor loading obstructs water and detergent from reaching all dishes.
   Next: Rearrange dishes and run a new cycle.

Common causes

Parts matching

Replace parts if cleaning doesn't resolve the issue. Common parts include:

• Dishwasher filter (often clogged and needs cleaning)
• Detergent dispenser (may need replacement if faulty)
• Rinse aid dispenser (ensure it's filled and functional)
• Water inlet valve (replace if water supply is insufficient)

Always refer to your dishwasher's manual for specific part numbers and installation instructions.

When to call a professional

• If cleaning and basic troubleshooting don't resolve the issue
• If you suspect a faulty water inlet valve and lack the tools to replace it
• If the dishwasher still doesn't clean properly after replacing parts
• If you're unsure about electrical or plumbing repairs
• If the appliance is under warranty and you don't want to risk voiding it

FAQ

Related guides

• dishwasher not draining properly

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