Dishwasher Not Cleaning Dishes? 6 Causes (And How to Fix Each)
Most dishwashers stop cleaning because the filter and the spray arm holes are clogged with food debris, so water never reaches the dishes at full pressure. Pull the filter out of the tub floor, rinse it under warm water, and poke the spray arm holes clear with a toothpick. Takes about 15 minutes and costs nothing.
In this article
Finding your dishwasher isn't cleaning dishes as it should can be frustrating. Let’s explore some common causes and straightforward fixes to help you out.
Before you start dismantling anything, check if the problem is consistent across all cycles. Run a different cycle to see if the issue persists.
Start With These 30-Second Checks
- 1Ensure dishwasher is plugged in and the door is fully closed.
- 2Check if the water supply valve is turned on.
- 3Inspect the spray arms for clogs or obstructions.
- 4Make sure the detergent dispenser isn’t blocked.
1. Clogged Spray Arms
Clogged spray arms are a common reason dishes don't get clean. Food particles can block the tiny holes, reducing water flow.
- 1Remove the lower and upper spray arms.
- 2Use a toothpick or wire to clear out any blockages.
- 3Rinse the arms under running water.
- 4Reattach the spray arms securely.
Safety First
Always disconnect the dishwasher from the power supply before removing any parts.
2. Improper Loading
Overloading or incorrect arrangement can prevent water from reaching all areas. Proper loading ensures effective cleaning.
- 1Avoid overcrowding by keeping space between dishes.
- 2Place larger items at the sides or back.
- 3Ensure nothing blocks the detergent dispenser.
- 4Angle dishes to allow water to run off.
3. Incorrect Detergent Use
Using too much or the wrong type of detergent can leave residues, affecting cleaning performance.
- 1Use a detergent recommended by the manufacturer.
- 2Adjust the amount based on water hardness.
- 3Avoid using regular dish soap.
- 4Occasionally clean the detergent dispenser.
🛠️ Tools You Will Need
- •Toothpick - Clearing small blockages from spray arms
- •Wire brush - Scrubbing debris from spray arms
- •Screwdriver - Removing spray arms if necessary
- •Dishwasher cleaner - Removing detergent build-up
4. Filter Needs Cleaning
A clogged filter can hinder water flow, reducing cleaning efficiency. Regular cleaning keeps the filter clear.
- 1Locate the filter at the bottom of the dishwasher.
- 2Twist it counterclockwise to remove.
- 3Rinse it under warm water to remove debris.
- 4Reinstall the filter securely.
5. Faulty Inlet Valve
The inlet valve controls water entry. If it’s defective, the dishwasher might not fill properly.
- 1Turn off the power and water supply.
- 2Locate the inlet valve behind the lower panel.
- 3Test the valve with a multimeter for continuity.
- 4Replace if faulty.
Pro Tip
Run a vinegar cycle once a month to keep the dishwasher smelling fresh and prevent build-up.
6. Malfunctioning Circulation Pump
If the dishwasher still doesn’t clean well, the circulation pump might be failing. This is more complex and may require professional help.
- 1Disconnect power and water supply.
- 2Access the pump under the dishwasher.
- 3Check for blockages or wear.
- 4Consult a professional if replacement is needed.
Not sure which part is failing?
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Frequently asked questions
How much does it cost to fix a dishwasher that won't clean?
Cleaning the filter and spray arms costs nothing but ten minutes. A replacement spray arm runs about $20 to $40, a water inlet valve $25 to $60 for the part, and a circulation pump $150 to $300 fitted. On a machine over ten years old, a pump job is usually worth putting toward a new one.
Can I replace the water inlet valve myself?
Usually yes if your dishwasher plugs into a socket: unplug it, close the water valve, and swap the part with a screwdriver and a nut driver, about an hour. If the machine is wired straight into a junction box rather than a plug, leave it to an appliance technician or a licensed electrician.
How often do I have to clean the filter so this doesn't happen again?
Once a month covers most households. If you run it daily, scrape plates instead of rinsing, or wash a lot of greasy pans, make it every two weeks. It is a two minute job: twist the filter counterclockwise, rinse under warm water, drop it back in and twist to lock.
The dishes come out clean but my glasses have a white film. Is that the same problem?
No, that is usually hard water, not a fault. Fill the rinse aid reservoir, add dishwasher salt if your model has a softener, and run an empty cycle with two cups of white vinegar in a bowl on the top rack. If the film wipes off with a damp cloth, it is limescale.
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