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Dishwasher Not Cleaning Dishes?
Why are my dishes still dirty after running the dishwasher? Common causes, what you can check, and when to call technicians.
Trusted Since 2022
2022
Serving Since
60-Day Warranty
Mon–Fri 8am–5pm · Sat 8am–12pm · Sun Closed (CDT)
2022
Serving Since
Service-call pricing
FREE with repair — every tier goes toward your repair, $0 extra.
Standard Most appliances + brands | $99 |
Luxury High-end (Sub-Zero, Wolf, Miele, BlueStar, Thermador, etc.) | $99 |
Commercial Walk-in coolers, commercial laundry, restaurant equipment | $150 |
Warranty: 60-day parts and labor. Technician quotes the repair on-site before any work.
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It's frustrating when your dishwasher leaves your dishes less than sparkling, especially in a busy household here in Cottage Grove or nearby Saint Paul Park. You expect clean dishes after every cycle, and when that doesn't happen, it's easy to feel concerned. This page is here to help you understand why your dishwasher might not be cleaning effectively. We'll explore some of the most common culprits behind this issue, offer a few simple checks you can safely perform yourself, and guide you on when it's best to reach out to a professional for expert assistance.
Common causes of dishwasher not cleaning dishes
Improper Loading
minorCan DIY checkDishes blocking the spray arms or nesting together prevent water and detergent from reaching all surfaces. Overcrowding is a common culprit.
Clogged Filter or Spray Arms
importantCan DIY checkFood debris can accumulate in the filter or clog the small holes in the spray arms, reducing water pressure and its ability to clean.
Low Water Temperature
importantPro recommendedThe dishwasher needs hot water (ideally 120°F) to dissolve grease and activate detergent. If your water heater is set too low or there's an issue with the water inlet valve, cleaning suffers.
Worn Out Wash Arm Seals
importantPro recommendedLeaking seals in the wash arms can cause a loss of water pressure, meaning less water is effectively sprayed onto the dishes.
Faulty Water Inlet Valve
criticalPro recommendedIf the valve doesn't open fully or is clogged, the dishwasher won't get enough water to wash properly. This can also lead to a complete lack of water.
Detergent Issues
minorCan DIY checkUsing the wrong type or amount of detergent, or using old, ineffective detergent, can lead to poor cleaning results. Ensure you're using a detergent designed for automatic dishwashers.
Quick checks you can run safely
- 1
Check Dishwasher Loading
Ensure dishes are not blocking the rotation of the spray arms. Avoid nesting items and make sure water can reach all surfaces.
- 2
Inspect and Clean the Filter
Locate the filter at the bottom of the dishwasher tub (usually twists out). Remove and rinse it thoroughly under running water. Check for any food debris or obstructions.
Safety: Ensure the dishwasher is unplugged from the power source before reaching into the tub. - 3
Verify Spray Arm Rotation and Holes
Manually spin the spray arms to ensure they move freely. Check the small holes in the arms for clogs and clear them with a toothpick or wire if necessary.
Safety: Be careful of sharp edges on the spray arms. - 4
Check Water Temperature
Run the hot water at a nearby sink until it's fully hot. Then, immediately start the dishwasher. This ensures the dishwasher fills with hot water.
- 5
Review Detergent Usage
Confirm you are using a detergent specifically made for automatic dishwashers and that you are using the recommended amount. Check the detergent's expiration date.
When to call a pro right away
Dishwasher does not fill with water at all
This could indicate a problem with the water supply line or the water inlet valve, which requires professional diagnosis and repair.
You hear unusual noises during the wash cycle
Grinding, banging, or excessive humming could signal a failing pump motor or other internal component that needs expert attention.
The dishwasher leaks water
Leaks can cause significant water damage to floors and cabinets. Identifying the source of the leak often requires specialized tools and knowledge.
The dishwasher does not drain
A failure to drain can be caused by a clogged drain hose, a faulty drain pump, or issues with the air gap or garbage disposal connection, all of which need professional assessment.
Saw a red flag above? Don't wait.
transparent service-call pricing (applied to repair) — applied to your repair.
Typical repair time once diagnosed: 75 minutes
Error code on your display?
Look up your brand's error codes for dishwasher not cleaning dishes — we cover the most common codes for each brand we service.
This page provides general diagnostic guidance for dishwasher not cleaning dishes. Specific causes and repairs vary by appliance brand, model, and condition. For accurate diagnosis, contact a licensed appliance repair technician. Repairs involving refrigerant systems, gas lines, or high-voltage circuits require certified professionals — DIY attempts on these systems may be illegal and dangerous.
How our repair process works
Five steps from your first call to the warranty receipt. No surprises.
- 1
Inspection
Your technician examines the appliance, listens to your description, and notes the model + serial for parts lookup. Visual + audio-based diagnostics first — non-invasive.
- 2
Diagnostics
Targeted tests on the failing subsystem (compressor, control board, heating element, motor, etc.) to identify the exact root cause. You get a clear explanation, not jargon.
- 3
Fix decision
Up-front estimate before any work begins: cost, parts, and the realistic likelihood of success vs. recommending replacement on an old or uneconomical unit. You decide.
- 4
Operational test
After the repair we run the appliance through its normal cycle on-site — never "it should work now, call us if it doesn't." You sign off when it's actually working.
- 5
Warranty + consultation
Receipt with warranty terms in writing. Plus a quick walkthrough of how to extend the appliance's life (filter cleaning, drain maintenance, etc.) — included free.
What our customers say
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GoogleThe technician was very polite and professional. He got to work right away, quickly found the cause of the problem, and was able to fix my ice maker. The repair was done quickly and efficiently, and everything is working perfectly now! I’m very happy with the…
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