How to Fix a Dishwasher Not Cleaning (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

To fix a dishwasher not cleaning, check the spray arms for clogs, clean the filter, and ensure the water temperature is at least 120°F. Run a cleaning cycle with vinegar or a dishwasher cleaner.

Confirm the symptom

Dishes still have food particles after a cycle
Spray arms are not spinning freely
Water temperature feels cool during operation
Detergent isn't dissolving properly
Dishes appear streaky or spotted

Tools and prep

Rubber gloves
Plastic scraper or toothpick
Vinegar or dishwasher cleaner
Soft brush (toothbrush works)
Screwdriver (if needed for filter access)
Thermometer (to check water temp)
Turn off power at the circuit breaker for safety
Shut off water supply if removing parts

Step-by-step troubleshooting

Check Spray Arms for Clogs
Do: Remove the lower and upper spray arms. Use a toothpick or pin to clear any clogged holes.
Observe: Water sprays evenly from all holes when rinsed.
Means: Unclogged spray arms improve cleaning performance.
Next: Clean the filter next.
Clean the Filter
Do: Locate the filter at the bottom of the dishwasher. Remove and rinse it under running water, using a soft brush to remove debris.
Observe: Filter is free of food particles and debris.
Means: A clean filter prevents blockages and improves water flow.
Next: Check the water temperature.
Check Water Temperature
Do: Place a thermometer in the dishwasher during a fill cycle. Ensure the water reaches at least 120°F (49°C).
Observe: Water temperature is below 120°F.
Means: Cold water reduces detergent effectiveness and cleaning power.
Next: Adjust the hot water heater if necessary.
Run a Cleaning Cycle
Do: Place a cup of white vinegar in a dishwasher-safe container on the top rack. Run a hot water cycle without dishes to clean the interior.
Observe: Odors and residue are reduced after the cycle.
Means: This removes buildup that can impair cleaning performance.
Next: Test with a normal load.
Test with a Normal Load
Do: Load dishes normally, use recommended detergent, and run a complete cycle.
Observe: Dishes are clean and free of food particles.
Means: Issue resolved with basic cleaning and maintenance.
Next: If still dirty, check the detergent dispenser.
Check Detergent Dispenser
Do: Inspect the dispenser for clogs or damage. Clean with warm water and a soft brush if needed.
Observe: Detergent releases freely during the cycle.
Means: A clear dispenser ensures proper detergent distribution.
Next: If no improvement, inspect the pump or call a professional.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged spray arms Blocked water flow prevents proper cleaning.	Common	Easy	None
Dirty or clogged filter Debris restricts water flow and traps food particles.	Common	Easy	None
Low water temperature Cold water reduces detergent effectiveness.	Common	Easy	None
Improper detergent use Wrong type or amount affects cleaning performance.	Sometimes	Easy	Dishwasher detergent
Faulty detergent dispenser Clogged or damaged dispenser prevents proper release.	Sometimes	Easy–Medium	Detergent dispenser kit
Worn or damaged pump Weak pump reduces water pressure and spray force.	Rare	Hard	Pump motor assembly
Blocked drain hose Standing water reduces cleaning efficiency.	Rare	Medium	Drain hose or plumber's snake
Malfunctioning heating element Inadequate heat prevents proper sanitization and cleaning.	Rare	Hard	Heating element replacement
Incorrect load size or placement Overloading or poor placement blocks water spray.	Sometimes	Easy	None
Worn seals or gaskets Leaks reduce water pressure and spray effectiveness.	Rare	Medium	Seals or gaskets

Parts matching

Replace parts if cleaning doesn't solve the issue. Match symptoms to common parts:

Clogged spray arms: No replacement needed—clean thoroughly
Dirty filter: Clean or replace if damaged
Low water temperature: Adjust water heater or install a booster
Faulty dispenser: Replace dispenser kit
Worn pump: Replace pump motor assembly
Blocked drain: Clear with a snake or replace hose
Malfunctioning heating element: Replace element if not heating

Purchase OEM parts for compatibility and reliability.

When to call a professional

Dishes remain dirty after multiple cleaning cycles and part replacements
Water leaks from the dishwasher base or pump area
Unusual noises during the spray cycle
Persistent bad odors despite cleaning
You suspect electrical issues (burnt smell, sparks)

FAQ

How often should I clean my dishwasher filter?

Clean the filter every 1–2 months to prevent clogs and maintain performance.

Can I use regular dish soap in my dishwasher?

No—dishwasher detergent is formulated to dissolve properly and avoid suds buildup.

Why does my dishwasher leave streaks on dishes?

Streaks often indicate hard water buildup. Use a water softener or rinse aid.

How do I know if the heating element is bad?

If dishes aren't dry and water feels cold at the end of the cycle, the heating element may be faulty.

What causes a dishwasher to not spray water?

Clogged spray arms, low water pressure, or a faulty pump are common causes.