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Dishwasher Guides · Updated August 7, 2026

Dishwasher Runs but Does Not Clean the Dishes: Common Causes

A dishwasher that fills, runs, and completes the cycle but leaves food, grease, or detergent residue on the dishes usually has a water-temperature, circulation, spray-arm, filter, detergent, loading, or heating problem.

The dishwasher may appear to operate normally while the wash system is not producing enough water pressure or the spray pattern is being blocked.

By Art’s Appliance Repair · Reviewed by Art, Appliance Repair Technician

Open dishwasher with dishes still dirty after a completed wash cycle

What Kind of Cleaning Problem Do You Have?

The condition of the dishes can help narrow down the cause.

Food remains on the dishes

Likely areas include:

  • Clogged filter.
  • Blocked spray arms.
  • Weak circulation pump.
  • Poor loading.
  • Not enough water.

Grease remains on plates and cookware

Possible causes include:

  • Water too cold.
  • Weak detergent.
  • Heating problem.
  • Short or eco cycle.
  • Poor circulation.

Detergent remains in the dispenser

Possible causes include:

  • Blocked dispenser door.
  • Weak water circulation.
  • Spray arm not reaching the dispenser.
  • Detergent pod getting wet before the cycle.
  • Dispenser problem.

Glasses look cloudy

This may involve:

  • Hard water.
  • Too much detergent.
  • Too little detergent.
  • Rinse-aid setting.
  • Mineral deposits.
  • Permanent glass etching.

Only the upper or lower rack is dirty

This often points to:

  • Blocked spray arm.
  • Damaged rack feed tube.
  • Diverter problem.
  • Circulation problem.
  • Incorrect rack position.

Loading and Cycle Problems

1. The Dishwasher Is Overloaded

Packing too many dishes into the dishwasher can block water from reaching all surfaces.

Common signs include:

  • Dishes touching each other.
  • Bowls nested together.
  • Utensils stacked tightly.
  • Large pans blocking spray arms.
  • Glasses shielding dishes below.

Water needs clear paths between items.

Leave enough space for the spray to reach the dirty surfaces.

2. Dishes Are Loaded Incorrectly

A dishwasher can be fully loaded without being overloaded, but placement still matters.

Avoid:

  • Bowls facing upward.
  • Plates facing away from the spray.
  • Large pans blocking the detergent dispenser.
  • Tall items preventing the spray arm from rotating.
  • Utensils nested together.

Place dirty surfaces toward the center and spray path.

3. A Large Item Is Blocking a Spray Arm

Before starting the dishwasher, rotate the spray arms by hand.

They should move freely without hitting:

  • Baking sheets.
  • Tall plates.
  • Pot handles.
  • Utensils.
  • Cutting boards.

If a spray arm cannot rotate, an entire rack may remain dirty.

4. The Wrong Cycle Is Selected

Eco, Quick, Light, or Express cycles may use:

  • Less water.
  • Lower temperatures.
  • Shorter wash times.
  • Fewer rinses.

These cycles may not clean heavily soiled cookware as well as a Normal or Heavy cycle.

For heavily soiled dishes, test a longer cycle before assuming the dishwasher has failed.

5. The Cycle Is Being Interrupted

Opening the door frequently can reduce wash temperature and interrupt circulation.

A power interruption may also prevent the dishwasher from completing the expected wash sequence.

If the dishwasher repeatedly stops or resets, the problem should be diagnosed separately.

Filter and Sump Problems

6. The Dishwasher Filter Is Clogged

A dirty filter can reduce circulation and allow food particles to return to the dishes.

Common debris includes:

  • Food.
  • Paper labels.
  • Grease.
  • Seeds.
  • Broken glass.
  • Detergent buildup.

Possible symptoms include:

  • Dirty dishes.
  • Food particles inside glasses.
  • Bad odor.
  • Standing water.
  • Weak spray.
  • Grinding noise.

Remove and clean the filter according to the manufacturer’s instructions.

Use warm water and a soft brush when appropriate.

7. The Sump Area Is Blocked

Debris can collect below the filter near the circulation-pump inlet.

Possible obstructions include:

  • Broken glass.
  • Bones.
  • Plastic.
  • Labels.
  • Seeds.
  • Food particles.

A blocked sump can reduce the amount of water reaching the circulation pump.

Disconnect power before reaching into areas near pumps or electrical components.

Wear gloves because broken glass may be present.

Spray-Arm Problems

8. Spray-Arm Holes Are Clogged

Minerals, food debris, and detergent residue can block the small openings in a spray arm.

Possible symptoms include:

  • Weak cleaning in one rack.
  • Food remaining in the same locations.
  • Spray arm moving slowly.
  • Uneven cleaning.

Remove accessible debris carefully according to the owner’s manual.

Do not enlarge spray holes with a drill or sharp tool.

9. The Spray Arm Is Cracked

A cracked spray arm may leak water from the wrong location instead of directing pressure through the spray holes.

Possible signs include:

  • Poor cleaning.
  • Unusual water noise.
  • Arm not rotating correctly.
  • Visible split in the plastic.

A damaged spray arm generally needs replacement.

10. The Spray Arm Is Not Rotating

Spray arms rotate because of water pressure.

If an arm remains stationary, possible causes include:

  • Obstruction from dishes.
  • Clogged spray holes.
  • Damaged bearing.
  • Low water pressure inside the dishwasher.
  • Weak circulation pump.

You can note the spray-arm position before starting a cycle and carefully check whether it has moved after the wash portion.

Do not open the dishwasher during active spraying unless the manufacturer allows it.

11. The Upper Rack Water Feed Is Not Connecting

Many dishwashers feed the upper spray arm through a tube at the rear or side.

If the rack is not fully seated, the water connection may not seal correctly.

Possible symptoms include:

  • Lower rack cleans normally.
  • Upper rack remains dirty.
  • Upper spray arm has little pressure.

Check that the rack is positioned correctly and that the feed connection is not damaged.

Water-Fill Problems

12. The Dishwasher Is Not Getting Enough Water

A dishwasher may fill but still have an insufficient water level.

Possible causes include:

  • Partially closed water valve.
  • Clogged inlet screen.
  • Low household pressure.
  • Faulty inlet valve.
  • Float problem.
  • Control issue.

Low water level can cause:

  • Weak spray.
  • Poor detergent dissolving.
  • Circulation pump noise.
  • Dishes remaining dirty.

13. The Water Inlet Valve Is Restricted

The inlet valve controls water entering the dishwasher.

A valve can become restricted by:

  • Mineral buildup.
  • Debris.
  • Internal wear.
  • Electrical failure.

Possible symptoms include:

  • Slow filling.
  • Low water level.
  • Weak circulation.
  • Long pauses before washing.
  • Fill-related error code.

The valve should be tested before replacement.

14. The Float Is Stuck

The float helps prevent overfilling.

If it becomes stuck in the raised position, the dishwasher may stop filling too early.

Check for:

  • Food debris.
  • Detergent residue.
  • Broken plastic.
  • Obstruction around the float.

The float should move freely when the dishwasher is off.

15. Household Water Pressure Is Low

Low supply pressure can reduce the amount of water entering during the programmed fill time.

Possible causes include:

  • Partially closed shutoff valve.
  • Plumbing restriction.
  • Clogged supply line.
  • Household pressure problem.

If other nearby fixtures also have unusually low pressure, the problem may not be inside the dishwasher.

Circulation-Pump Problems

16. The Circulation Pump Is Weak

The circulation pump sends wash water through the spray arms.

A pump may still make noise while producing insufficient pressure.

Possible symptoms include:

  • Dishwasher fills normally.
  • Wash motor can be heard.
  • Spray arms barely move.
  • Dishes stay dirty.
  • Detergent remains.
  • Water appears calm instead of forceful during washing.

A weak pump may result from:

  • Worn motor.
  • Damaged impeller.
  • Internal blockage.
  • Electrical problem.

17. The Circulation Pump Is Not Running

If the dishwasher fills and then becomes unusually quiet, the wash pump may not be operating.

Possible symptoms include:

  • Water enters normally.
  • Little or no spraying sound.
  • Detergent remains in the dispenser.
  • Dishes stay completely dirty.
  • Drain pump still works.

The circulation motor, wiring, capacitor if used, and control output should be tested.

18. The Pump Impeller Is Damaged

A broken or loose impeller may allow the motor to run without producing normal water pressure.

Possible signs include:

  • Weak spray.
  • Unusual rattling.
  • Intermittent circulation.
  • Poor cleaning on both racks.

On many dishwashers, the circulation pump is replaced as an assembly.

Water-Temperature Problems

19. Incoming Water Is Too Cold

Dishwasher detergent and grease removal work better with adequately hot water.

Before starting the dishwasher, run the kitchen faucet until the water becomes hot.

This helps prevent the dishwasher from beginning with a long supply of cold water.

Do not raise the home water-heater setting beyond safe recommendations simply to improve dishwasher performance.

20. The Dishwasher Is Not Heating Properly

Many dishwashers heat water during parts of the cycle.

A heating problem may cause:

  • Greasy dishes.
  • Detergent residue.
  • Long cycle times.
  • Dishes not drying.
  • Temperature-related error codes.

Possible causes include:

  • Heating element.
  • Heater assembly.
  • Temperature sensor.
  • Wiring.
  • Control relay.

The heating system should be tested according to the model’s service information.

21. The Temperature Sensor Is Faulty

A thermistor or temperature sensor tells the control how warm the water is.

Incorrect readings may cause:

  • Wash temperature too low.
  • Unusually long cycle.
  • Heating stopping too early.
  • Error code.

The sensor should be tested at a known temperature and compared with manufacturer specifications.

Detergent and Water-Quality Problems

22. The Wrong Detergent Is Being Used

Use detergent specifically designed for automatic dishwashers.

Do not use regular hand dish soap.

The wrong detergent may cause:

  • Excessive suds.
  • Poor circulation.
  • Leaks.
  • Residue.
  • Ineffective cleaning.

23. Too Little Detergent Is Being Used

Hard water and heavily soiled dishes may require more detergent than lightly soiled loads.

Too little detergent may leave:

  • Grease.
  • Food residue.
  • Mineral film.

Follow the detergent and dishwasher manufacturer’s recommendations.

24. Too Much Detergent Is Being Used

More detergent does not always produce cleaner dishes.

Excessive detergent can cause:

  • Cloudy glassware.
  • Residue.
  • Film.
  • Poor rinsing.

Use an amount appropriate for:

  • Water hardness.
  • Load size.
  • Soil level.
  • Detergent concentration.

25. The Detergent Is Old or Damp

Dishwasher powder can absorb moisture and clump.

Pods may also deteriorate if stored in a humid area.

Old detergent may not dissolve or clean efficiently.

Store detergent in a cool, dry location.

26. The Detergent Dispenser Is Blocked

A large plate, cutting board, pan, or utensil may prevent the dispenser door from opening.

Before starting the dishwasher, make sure nothing blocks the dispenser.

27. The Detergent Dispenser Is Failing

A damaged dispenser may:

  • Remain closed.
  • Open too late.
  • Fail intermittently.

Possible causes include:

  • Broken latch.
  • Failed actuator.
  • Wiring issue.
  • Control-board problem.

Hard-Water and Rinse Problems

28. Hard Water Is Leaving Mineral Deposits

Southwest Florida homes can have mineral-heavy water.

Hard-water deposits may appear as:

  • White film.
  • Cloudy glassware.
  • Spots.
  • Scale on spray arms.
  • Buildup around the filter.

Mineral buildup can also restrict spray-arm openings.

A water softener or dishwasher-safe maintenance product may help where appropriate.

29. The Rinse Aid Is Empty

Rinse aid helps water sheet off dishes during rinsing and drying.

Low rinse aid can contribute to:

  • Spots.
  • Film.
  • Poor drying.
  • Water remaining on glassware.

Check the dispenser and setting.

30. The Rinse-Aid Setting Is Incorrect

Some models allow adjustment of rinse-aid dosage.

Too little may leave spots.

Too much may contribute to streaking or residue.

Follow the dishwasher manufacturer’s instructions.

Diverter and Rack-Specific Problems

31. The Diverter Is Not Directing Water Correctly

Some dishwashers alternate water pressure between different spray arms using a diverter.

A failed diverter may cause:

  • Upper rack dirty.
  • Lower rack dirty.
  • One spray arm not operating.
  • Recurring diverter error.

The diverter motor, seal, position sensor, and control should be checked.

32. The Rack Is Installed Incorrectly

An upper rack that is not fully engaged can prevent proper water connection.

This may happen after:

  • Removing the rack.
  • Adjusting rack height.
  • Loading oversized items.

Confirm that both sides of the rack are aligned and fully seated.

Control and Electrical Problems

33. The Control Board Is Not Running the Wash Pump Correctly

The main control board manages:

  • Water fill.
  • Circulation.
  • Heating.
  • Drain pump.
  • Detergent dispenser.
  • Cycle timing.

A control failure may cause:

  • Circulation stopping early.
  • Heater not activating.
  • Wash pump not receiving power.
  • Cycle skipping part of the wash.

The control board should not be replaced until the connected components and wiring are tested.

34. Wiring or a Connector Is Damaged

A loose or corroded connection may interrupt power to:

  • Circulation pump.
  • Heater.
  • Inlet valve.
  • Sensors.
  • Diverter.

Possible symptoms include:

  • Intermittent cleaning.
  • Error codes.
  • Dishwasher works after being moved or reset.
  • Burned connector.

35. The Dishwasher Needs a Reset

A temporary electronic error may affect the cycle.

A basic reset may help:

  1. Cancel the cycle.
  2. Disconnect power at the breaker or plug.
  3. Wait approximately five minutes.
  4. Restore power.
  5. Run a normal cycle.

If the problem returns, a reset is not a repair.

What Can You Safely Check?

Before scheduling service, you can:

  1. Clean the dishwasher filter.
  2. Check spray arms for visible blockage.
  3. Make sure spray arms rotate freely.
  4. Reload dishes so they do not block the spray.
  5. Run hot water at the sink before starting.
  6. Try a Normal or Heavy cycle.
  7. Use fresh automatic dishwasher detergent.
  8. Check the rinse-aid level.
  9. Confirm the water-supply valve is fully open.
  10. Check whether the upper rack is fully seated.
  11. Record any error code.
  12. Note whether you hear strong spraying during the wash phase.
  13. Check whether only one rack is affected.
  14. Reset the dishwasher once if necessary.

Do not remove electrical panels while the dishwasher is connected to power.

Do not reach into the sump without disconnecting power, and use gloves because broken glass may be present.

When Should You Stop Using the Dishwasher?

Stop the dishwasher and disconnect power when:

  • Water leaks onto the floor.
  • You smell burning wiring or plastic.
  • The breaker repeatedly trips.
  • The circulation pump makes severe grinding noises.
  • Electrical components become wet.
  • Smoke is present.
  • The dishwasher overheats.

Turn off the water-supply valve if there is an active leak.

When Should You Call a Dishwasher Technician?

Professional diagnosis is recommended when:

  • The filter and spray arms are clean but dishes remain dirty.
  • The spray arms do not rotate.
  • The dishwasher fills but there is little spraying sound.
  • The circulation pump is weak or silent.
  • Water level appears too low.
  • The dishwasher does not heat properly.
  • One rack consistently does not clean.
  • Detergent repeatedly remains in the dispenser.
  • The dishwasher displays recurring error codes.
  • The problem returns after cleaning and reloading correctly.

A technician can test the circulation pump, inlet valve, heater, temperature sensor, diverter, spray system, wiring, and control board.

Should You Repair or Replace the Dishwasher?

Repair is often practical when the problem involves:

  • Filter.
  • Spray arm.
  • Inlet valve.
  • Circulation pump.
  • Heater.
  • Temperature sensor.
  • Diverter.
  • Detergent dispenser.
  • Wiring.
  • Control board.

Replacement may be more practical when:

  • The tub is damaged.
  • Severe corrosion is present.
  • Several major components have failed.
  • Critical parts are discontinued.
  • The dishwasher has repeated leaks.
  • Repair cost approaches the value of a replacement appliance.

A complete diagnosis should be performed before deciding.

Photo guide

Diagnostic Photos

Dishwasher filter lifted out with food debris and a soft cleaning brush nearby
A clogged filter can reduce water movement and leave food on dishes after the cycle.
Dishwasher spray arm with mineral buildup around several blocked spray holes
Blocked spray-arm holes can stop water from reaching the rack evenly.
Dishwasher rack loaded with a pan blocking wash action and detergent residue on the door
Poor loading or a blocked dispenser can leave detergent residue and dirty dishes.

Local Dishwasher Service

We provide dishwasher repair in Cape Coral and Fort Myers, along with surrounding Southwest Florida service areas.

For scheduling, use the Contact page or call/text Art’s Appliance Repair directly.

Need service?

Dishwasher Repair in Cape Coral, Fort Myers and Southwest Florida

Art’s Appliance Repair provides dishwasher diagnostics and repair throughout Cape Coral, Fort Myers, North Fort Myers, Lehigh Acres, Estero, Bonita Springs, Naples, and surrounding Southwest Florida communities.

We diagnose dishwasher problems including:

  • Dishwasher runs but does not clean dishes.
  • Weak water circulation.
  • Circulation-pump failures.
  • Clogged spray arms.
  • Low water level.
  • Heating problems.
  • Detergent not dissolving.
  • Upper or lower rack not cleaning.
  • Hard-water buildup.
  • Dishwasher not draining.
  • Dishwasher leaking.
  • Control-board and sensor problems.

Call or text (239) 688-9955 to schedule dishwasher service.

Text (239) 688-9955 Call (239) 688-9955

Service call: $0 with an approved repair. A $79 diagnostic fee may apply if the repair is declined.

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