A dishwasher is designed to handle one of the most repetitive kitchen jobs, but like any appliance, it can eventually develop problems. A dishwasher may refuse to start, stop in the middle of a cycle, fail to drain, leave dishes dirty, leave water inside the tub, make unusual noises, produce unpleasant odors, fail to dry dishes, or appear to run without filling with water.
The good news is that many dishwasher problems are caused by relatively simple issues such as a blocked filter, incorrectly loaded dishes, a kinked hose, a closed water-supply valve, a blocked spray arm, detergent problems, or an interrupted cycle. Manufacturer troubleshooting guidance consistently recommends checking these basic conditions before assuming that a major component has failed.
This dishwasher troubleshooting checklist provides a systematic way to identify common problems without immediately calling for service. It covers the most frequent symptoms, what to inspect first, what you can safely do yourself, when a reset may help, and when the problem requires a qualified appliance professional.
The instructions are intended to be broadly useful for households in the United States, Canada, and the United Kingdom. However, dishwasher designs, electrical connections, plumbing arrangements, error codes, and maintenance instructions vary by model. Your owner’s manual should always take priority over general advice.
Dishwasher Troubleshooting Checklist at a Glance
Before moving into detailed troubleshooting, use this quick checklist:
- ☐ Is the dishwasher receiving power?
- ☐ Is the circuit breaker on?
- ☐ Is the dishwasher door fully closed and latched?
- ☐ Is Control Lock or Child Lock enabled?
- ☐ Is Delay Start selected?
- ☐ Is the water-supply valve open?
- ☐ Is the water-supply hose kinked?
- ☐ Is the dishwasher filter clean?
- ☐ Are the spray arms free from blockage?
- ☐ Can the spray arms rotate freely?
- ☐ Is the dishwasher overloaded?
- ☐ Is the detergent dispenser opening?
- ☐ Is the correct amount of detergent being used?
- ☐ Is rinse aid available if the model uses it?
- ☐ Is there standing water in the bottom?
- ☐ Is the drain hose kinked or blocked?
- ☐ Is the sink drain or garbage-disposal connection blocked?
- ☐ Is an air gap blocked, if fitted?
- ☐ Was the dishwasher recently installed?
- ☐ Is an error code displayed?
- ☐ Has the dishwasher been reset?
- ☐ Are there leaks, burning smells, electrical faults, or repeated breaker trips?
Start with the simplest checks and move toward more complicated possibilities. This approach prevents unnecessary disassembly and can often identify the cause quickly.
1. Dishwasher Will Not Turn On
If the dishwasher appears completely dead, begin with the power supply rather than immediately assuming that the control board has failed.
Check whether the dishwasher display, indicator lights, or interior light responds. If there is no response, check the electrical supply, including the circuit breaker or fuse serving the appliance. For plug-connected installations, make sure the plug is properly connected and that the outlet is functioning. Manufacturer troubleshooting guidance identifies power supply and circuit-breaker checks among the first steps for a dishwasher that does not start.
If the appliance is hard-wired, do not remove electrical panels unless you are qualified to work safely with household electrical systems. A dishwasher can contain live electrical connections even when its controls appear inactive.
Checklist
- Check the circuit breaker.
- Check the fuse where applicable.
- Check the power connection.
- Look for an error display.
- Check whether Control Lock is enabled.
- Confirm the door is closed.
- Check whether Delay Start is active.
- Try the manufacturer’s recommended reset procedure.
If the breaker immediately trips again after being reset, stop troubleshooting and arrange professional service. Repeated breaker trips can indicate an electrical or appliance fault.
2. Dishwasher Has Power but Will Not Start
A dishwasher that has lights but does not begin its cycle may not actually have a major mechanical failure.
First, make sure the door is completely closed. Dishwashers use door-latching systems as a safety measure, so an improperly closed or latched door can prevent the cycle from starting. Manufacturer troubleshooting instructions specifically identify door closure as an important starting check.
Next, check the control panel for Lock, Delay, Sleep, Standby, or similar settings. Some models may appear inactive when a special control mode has been selected.
Checklist
- Door fully closed?
- Door latch engaging?
- Control Lock disabled?
- Delay Start disabled?
- Correct cycle selected?
- Start button pressed correctly?
- Water supply turned on?
- Error code displayed?
If the dishwasher has power but still does nothing after these checks, a faulty door switch, control system, or other electrical component may require professional diagnosis.
3. Dishwasher Starts Then Stops
A dishwasher that begins a cycle but stops later can have several possible causes.
First determine whether the door was opened during the cycle. Some dishwashers pause when the door is opened and require the cycle to be resumed manually. A power interruption can also interrupt a cycle, depending on the appliance.
Next, check whether the dishwasher is able to drain. A drainage problem can prevent the machine from progressing normally through the cycle.
If an error code appears, record it before resetting the appliance. Error codes are model-specific, so the owner’s manual is the appropriate reference for interpreting them.
4. Dishwasher Stops Mid-Cycle
A dishwasher stopping mid-cycle does not automatically mean the motor or control board has failed.
Check whether there was a power outage, whether the door was opened, whether water remains in the tub, and whether an error code is displayed.
If the dishwasher stops with water inside, investigate drainage. If it stops without water and does not restart, investigate power, controls, door-latch operation, and water supply.
Manufacturer troubleshooting guidance recommends checking whether the cycle was interrupted, whether the appliance is draining, and whether an error code is present.
5. Dishwasher Is Not Filling With Water
A dishwasher that runs but does not appear to fill with water may have a water-supply problem.
Start by checking the water-supply valve beneath the sink or at the dishwasher connection. It should be fully open. Next, inspect the water-supply hose for kinks or crushing.
Manufacturer troubleshooting guidance identifies a closed water valve and kinked or blocked supply hose as basic checks when a dishwasher does not fill.
Check the following:
- Water-supply valve open?
- Supply hose kinked?
- Supply hose crushed?
- Water supply interrupted?
- Inlet connection leaking?
- Error code displayed?
- Door fully latched?
If the water supply is correct but the appliance still does not fill, possible causes can include the inlet valve, float system, door switch, wiring, or electronic controls.
6. Dishwasher Runs Without Water
If you hear the dishwasher operating but do not hear water entering the tub, stop and investigate.
Do not allow a dishwasher to continue operating indefinitely if it is not filling correctly.
Check the water valve and supply hose first. If those are correct, the problem may involve the inlet valve, float system, control system, or another component.
Manufacturer support guidance lists water-supply problems, inlet-valve problems, float-related problems, and door-switch issues among possible causes of a dishwasher that does not fill correctly.
7. Dishwasher Is Not Draining
A dishwasher that leaves water in the bottom is one of the most common troubleshooting situations.
The first things to inspect are the filter, pump area, drain hose, and sink connection.
Food particles, glass fragments, grease, and other debris can obstruct the filter or pump. A kinked drain hose can restrict water flow, while a blockage at the sink, garbage-disposal connection, or air gap can prevent wastewater from leaving the appliance.
Dishwasher Not Draining Checklist
- Clean the filter.
- Inspect the pump area.
- Look for visible debris.
- Check the drain hose.
- Look for kinks or crushing.
- Check the sink connection.
- Check the garbage-disposal connection where applicable.
- Check the air gap if installed.
- Confirm the drain hose is routed correctly.
- Run a short drain or rinse cycle.
8. There Is Water at the Bottom of the Dishwasher
Do not automatically assume that any water visible inside a dishwasher means it has failed.
Some dishwasher designs retain a small amount of water in the sump or filter area as part of their normal operation. Manufacturer technical documentation notes that a small amount of water can remain in certain sump areas after a cycle.
However, substantial water covering the bottom of the tub or water rising toward the door is different.
If there is significant standing water, investigate the filter, pump, drain hose, sink connection, and other drainage components.
9. Dishwasher Is Backing Up With Dirty Water
Dirty water returning into the dishwasher can indicate a drainage or installation problem.
Check the drain hose routing and the sink or disposal connection.
A properly routed drain hose or appropriate air-gap arrangement helps prevent wastewater from flowing backward into the dishwasher. A blocked air gap or incorrect hose routing can contribute to drainage and backflow problems.
If the problem began after plumbing work under the sink, pay particular attention to the dishwasher drain connection.
10. Newly Installed Dishwasher Will Not Drain
A newly installed dishwasher that refuses to drain deserves a slightly different troubleshooting approach.
If the dishwasher is connected to a garbage disposal, verify that the dishwasher inlet’s knockout plug was removed during installation. A retained knockout plug can completely prevent the dishwasher from draining through the disposal connection.
Also inspect:
- Drain hose routing
- High-loop arrangement
- Air gap, if required
- Sink connection
- Disposal connection
- Hose kinks
Installation requirements vary by location and model, so follow the installation instructions and applicable local plumbing requirements.
11. Dishwasher Is Not Cleaning Dishes
If dishes come out dirty, begin with the filter and spray arms.
A blocked filter can interfere with water circulation and allow food particles to remain in the wash system. Blocked spray-arm openings can reduce water distribution. Improper loading can also prevent water from reaching dishes effectively.
Dishwasher Not Cleaning Checklist
- Clean the filter.
- Inspect spray arms.
- Clear blocked spray openings.
- Make sure spray arms rotate freely.
- Do not overload the dishwasher.
- Separate dishes properly.
- Prevent large objects from blocking the spray arms.
- Check detergent.
- Check the selected cycle.
- Check water temperature.
- Check rinse aid if applicable.
12. Dishwasher Leaves Food on Dishes
Food residue can result from poor filtration, restricted water circulation, incorrect loading, insufficient detergent, unsuitable cycle selection, or water-temperature problems.
Start with the simplest possibilities.
Clean the filter and inspect the spray arms. Then examine how dishes are positioned. Tall pans and large plates can block spray arms, while tightly packed dishes can prevent water from reaching surfaces. Manufacturer guidance emphasizes proper loading, clear spray-arm movement, and regular filter cleaning.
13. Dishwasher Leaves Grit or Sand-Like Residue
Gritty residue can be caused by food particles, mineral deposits, detergent residue, or inadequate water circulation.
Inspect the filter first.
If the filter is dirty, clean it according to the manufacturer’s instructions. Then inspect the spray arms and dishwasher interior.
If the residue is white or chalky rather than food-like, hard-water mineral buildup may be involved.
14. Dishwasher Leaves White Film on Dishes
White film can have several causes.
Possible causes include:
- Hard-water minerals
- Excess detergent
- Incorrect detergent
- Poor rinsing
- Inadequate water softening
- Low water temperature
- Detergent residue
If your dishwasher has a water-softener system, make sure the hardness setting is correctly configured and that the salt reservoir is maintained according to the manufacturer’s instructions.
If you live in an area with hard water, mineral buildup should be considered whenever white deposits repeatedly appear.
15. Dishwasher Leaves Detergent in the Dispenser
If detergent remains in the dispenser after the cycle, first check whether the dispenser door was blocked by a dish.
Then inspect the dispenser for hardened detergent.
Detergent that does not dissolve can also be associated with water-temperature or dispensing problems. Manufacturer guidance recommends checking the dispenser, detergent use, and operating conditions when detergent remains after a cycle.
Check:
- Dispenser door unobstructed?
- Detergent fresh and dry?
- Correct amount used?
- Dispenser clean?
- Spray arms functioning?
- Water entering properly?
- Appropriate cycle selected?
16. Dishwasher Detergent Tablet Does Not Dissolve
A tablet that remains partly intact can indicate that water is not reaching the dispenser correctly or that the operating conditions are unsuitable.
Check whether a large plate, cutting board, pan, or other item blocks the dispenser door.
Also check the spray arms and water supply.
Manufacturer troubleshooting guidance specifically lists undissolved detergent tablets among causes of poor cleaning results.
17. Dishwasher Is Not Drying Dishes
Poor drying does not necessarily mean the dishwasher’s heating system has failed.
Drying performance depends on the dishwasher’s drying technology, cycle selection, rinse aid, load arrangement, and the types of items being washed.
Plastic containers often retain more water than glass or ceramic dishes because of their material and surface characteristics.
Check whether your dishwasher has a heated drying, condensation drying, fan-assisted drying, or another drying system and follow the model’s instructions.
If drying performance suddenly changes, check rinse aid, cycle settings, and loading before assuming a component failure.
18. Dishwasher Leaves Water Spots on Glasses
Water spots are commonly associated with minerals in the water and insufficient rinsing performance.
Rinse aid can help water run off dish surfaces more effectively.
If your dishwasher has a water-softening system, make sure it is set appropriately for the local water hardness and maintained as required.
If spots are accompanied by a white chalky film, mineral buildup may be a more significant concern.
19. Dishwasher Has a Bad Smell
Persistent dishwasher odors usually have a source.
Inspect the:
- Filter
- Pump area
- Bottom of tub
- Door gasket
- Spray arms
- Drain area
- Drain hose
- Sink connection
Food particles trapped in the filtration system can contribute to unpleasant odors. Regular filter maintenance is therefore important.
If the smell resembles sewage, investigate the drain connection and wastewater routing rather than simply using more cleaning chemicals.
20. Dishwasher Smells Like Rotten Food
A rotten-food smell is often associated with trapped organic material.
Clean the filter and inspect the bottom of the dishwasher.
Look for:
- Food particles
- Grease
- Seeds
- Labels
- Small pieces of packaging
- Debris around the pump
Also check whether water is draining correctly.
A dishwasher that repeatedly develops food odors may need more frequent filter inspection, especially in a household that runs many loads.
21. Dishwasher Smells Like Sewage
A sewage-type odor deserves more attention than a normal food smell.
Possible causes include drainage configuration, standing wastewater, a blocked drain connection, or improper hose routing.
Check the drain hose and sink connection.
If the odor persists after cleaning and drainage checks, have the plumbing arrangement inspected.
Do not repeatedly pour drain chemicals into the dishwasher.
22. Dishwasher Makes a Humming Noise
Some humming is normal during dishwasher operation because pumps and motors generate operating sounds.
However, a sudden change in sound can indicate a problem.
A humming sound accompanied by poor drainage can suggest that the drain pump is running but water is not moving effectively. Debris around the pump or impeller can be one possible cause.
Inspect accessible areas according to the manufacturer’s instructions.
23. Dishwasher Makes a Grinding Noise
Grinding can be caused by hard debris such as glass or other objects entering the pump area.
Stop the cycle if the sound is severe or unusual.
After disconnecting power according to the manufacturer’s safety instructions, inspect accessible filter and pump areas for foreign objects.
Be extremely careful because broken glass and sharp objects may be present. Manufacturer guidance specifically warns about sharp debris when inspecting pump areas.
24. Dishwasher Makes a Rattling Noise
Rattling may be caused by dishes, utensils, racks, or other objects vibrating during operation.
Before assuming there is a mechanical failure:
- Check the racks.
- Make sure dishes are stable.
- Separate utensils.
- Ensure spray arms are not hitting dishes.
- Check whether the noise occurs only at certain points of the cycle.
If the noise persists when the dishwasher is empty, professional diagnosis may be appropriate.
25. Dishwasher Is Too Loud
Modern dishwashers can make several normal operating sounds, including water movement, pump operation, valve sounds, and drainage noises.
A sudden increase in noise is more significant than the absolute noise level.
Compare the dishwasher’s current sound with its normal operation.
Grinding, repeated clicking, harsh vibration, or unusual mechanical sounds deserve attention.
26. Dishwasher Is Leaking From the Door
A door leak can have several causes.
Check:
- Door gasket
- Door alignment
- Overloaded racks
- Items protruding through the door
- Excessive detergent
- Dishwasher leveling
- Spray-arm operation
A damaged gasket may need replacement.
Do not continue operating an appliance that is producing a significant leak, especially if water can reach electrical components or flooring.
27. Dishwasher Is Leaking From Underneath
A leak underneath the dishwasher can originate from hoses, connections, pumps, seals, valves, or other components.
If water is actively leaking, stop the dishwasher and shut off the water supply if appropriate.
For significant leaks, do not repeatedly run test cycles while water is entering cabinets or flooring.
Professional service may be required to identify the exact source.
28. Dishwasher Is Overfilling
If water rises unusually high inside the dishwasher, stop the appliance.
Possible causes can include problems involving the water inlet system, float system, control system, or other components.
Do not continue operating a dishwasher that is visibly approaching the door level or overflowing.
If the dishwasher continues filling when it should not, shut off the water supply and arrange professional service.
29. Dishwasher Keeps Filling With Water When Off
Water entering a dishwasher when it is not running is different from normal filling during a wash cycle.
A malfunctioning inlet valve is one possible cause.
If water continues entering when the dishwasher is switched off, turn off the dishwasher’s water supply valve.
Do not ignore the problem because continuous filling can eventually result in flooding.
If the water continues entering despite the appliance being off and the supply valve is closed, the plumbing arrangement itself may need immediate attention.
30. Dishwasher Has Standing Water and Won’t Drain
Use this troubleshooting order:
Step 1: Turn Off Power
Follow the manufacturer’s safety instructions and disconnect power before accessing components.
Step 2: Remove Excess Water
Use towels, a container, or an appropriate hand pump if necessary.
Step 3: Check the Filter
Remove and clean the filter according to the owner’s manual.
Step 4: Inspect the Pump Area
Look for visible debris.
Step 5: Check the Drain Hose
Look for kinks, crushing, or blockage.
Step 6: Check the Sink Connection
Inspect the dishwasher connection to the sink or disposal.
Step 7: Check the Air Gap
If fitted, inspect it for blockage.
Step 8: Test Drainage
Run an appropriate short cycle or drain function.
These steps closely follow manufacturer troubleshooting recommendations for common drainage failures.
31. Dishwasher Has an Error Code
Never guess what an error code means based solely on a generic internet list.
Error codes vary between manufacturers and even between model families.
Write down the exact code, including letters and numbers.
Then consult the owner’s manual for your exact model.
Manufacturer troubleshooting resources commonly organize error codes around problems such as long drainage, water supply detection, pump faults, and control faults.
Error Code Checklist
- Record the exact code.
- Photograph the display if useful.
- Check the owner’s manual.
- Perform only recommended user-level checks.
- Reset only when the manual recommends it.
- If the code returns, arrange service.
32. Should You Reset a Dishwasher?
A reset can sometimes clear a temporary control issue.
Some manufacturer instructions recommend disconnecting power for a short period and restoring it as a control reset.
However, resetting the dishwasher does not repair a physical blockage, failed pump, leaking valve, broken hose, or damaged electrical component.
Use a reset as a troubleshooting step, not as a substitute for diagnosis.
33. How to Reset a Dishwasher Safely
The reset method varies.
Some models have a Cancel or Reset button sequence.
Others may require power to be disconnected temporarily.
If the dishwasher is plugged into an accessible outlet, follow the manufacturer’s instructions.
If the dishwasher is hard-wired, do not remove panels or manipulate electrical wiring merely to perform a reset. Use the appropriate circuit breaker only as directed by the manufacturer.
34. Dishwasher Does Not Respond After a Power Outage
A power interruption can leave some electronic controls in an interrupted state.
Check whether the dishwasher display returns to normal after power is restored.
If the manufacturer recommends a reset, perform that procedure.
If the dishwasher remains unresponsive, check the circuit breaker and then consult the owner’s manual.
35. Dishwasher Has No Water Pressure
A dishwasher requires an adequate water supply to fill and wash effectively.
If other household fixtures have poor water pressure, the problem may not be the dishwasher itself.
Check the household water supply.
Also inspect the dishwasher supply hose for kinks.
If only the dishwasher has a water-supply problem, the inlet valve, supply connection, or associated components may need investigation.
36. Dishwasher Takes Too Long to Complete a Cycle
Modern dishwashers can have relatively long cycle times because they may use sensors, lower water consumption, multiple wash phases, heating periods, and drying stages.
Therefore, a long cycle is not automatically a fault.
However, if the cycle time suddenly becomes much longer than normal, investigate:
- Water temperature
- Water supply
- Drainage
- Error codes
- Filter condition
- Heating performance
- Cycle selection
If the dishwasher repeatedly pauses or extends cycles unexpectedly, professional diagnosis may be appropriate.
37. Dishwasher Is Not Heating Water
Water temperature has a major effect on detergent performance and cleaning.
If dishes remain greasy or detergent does not dissolve properly, water-temperature problems should be considered.
Do not open electrical or heating components unless qualified.
Check the household hot-water supply and model-specific requirements first.
If the dishwasher is filling and circulating normally but the water never heats, a heating component, sensor, wiring, or control system may be involved.
38. Dishwasher Uses Too Much Water
Water consumption varies by model and cycle.
If you believe the dishwasher is using significantly more water than normal, check for:
- Repeated cycles
- Incorrect cycle selection
- Water leaks
- Malfunctioning valves
- Sensor problems
- Continuous filling
If water enters the dishwasher when it is off, stop using it and investigate the inlet system immediately.
39. Dishwasher Uses Too Much Detergent
More detergent is not necessarily better.
Follow the detergent manufacturer’s and dishwasher manufacturer’s recommendations.
Excess detergent can contribute to residue and may be particularly noticeable in soft-water conditions.
If you have to keep increasing detergent to get clean dishes, investigate filtration, spray arms, loading, water temperature, and cycle selection instead.
40. Dishwasher Tablet Gets Stuck
If the tablet remains in the dispenser or drops into an unsuitable location, inspect how the dishwasher is loaded.
A large item can block the dispenser door.
Also check whether the dispenser itself has residue that interferes with opening.
Clean the dispenser according to the manufacturer’s instructions.
41. Dishwasher Spray Arms Are Not Spinning
The spray arms need to move freely for effective water distribution.
Check for:
- Tall dishes
- Pans
- Utensils
- Food debris
- Mineral buildup
- Damaged spray arms
Manufacturer troubleshooting instructions specifically recommend ensuring spray arms are unobstructed and able to rotate freely.
42. Dishwasher Filter Is Dirty
A dirty filter is one of the most important maintenance problems to address.
Remove and clean it according to the model’s instructions.
Use running water and a soft brush where recommended.
Avoid abrasive tools that could damage the filter.
How frequently the filter needs cleaning depends on the dishwasher and household usage.
Heavy-use households may need to inspect it more frequently than occasional users.
43. Dishwasher Has Glass in the Filter Area
Broken glass requires caution.
Do not put your bare fingers into an area containing broken glass.
Disconnect power according to the manufacturer’s instructions before accessing internal components.
Use appropriate protective equipment and tools to remove accessible debris.
If glass has entered the pump and cannot safely be removed, arrange professional service.
44. Dishwasher Is Not Cleaning the Upper Rack
If the upper rack is consistently dirty while the lower rack performs better, inspect the upper spray arm and its water path.
Check whether the arm rotates freely.
Look for blocked openings.
Make sure tall items in the lower rack are not interfering with the upper spray arm.
Also check that the rack is correctly positioned and that the water connection for the upper spray system is properly seated according to the model’s design.
45. Dishwasher Is Not Cleaning the Bottom Rack
Inspect the lower spray arm.
Check for:
- Blocked nozzles
- Food debris
- Mineral deposits
- Large pans blocking the arm
- Filter buildup
Also make sure dishes are not packed so tightly that water cannot circulate.
46. Dishwasher Leaves Grease on Dishes
Greasy dishes can indicate inadequate water temperature, insufficient detergent, poor spray coverage, overloaded racks, or filtration problems.
Start with:
- Clean filter.
- Inspect spray arms.
- Confirm correct detergent.
- Check loading.
- Check cycle selection.
- Verify hot-water supply.
If the dishwasher has suddenly stopped removing grease despite normal loading and detergent use, investigate water heating or circulation.
47. Dishwasher Leaves Food Particles After Every Cycle
If food particles consistently remain, do not simply increase detergent.
Inspect the filtration system first.
A blocked filter can allow food residue to remain in the wash system.
Then inspect spray arms and loading.
Manufacturer guidance emphasizes filter cleaning, proper loading, and unobstructed spray arms as basic steps for poor cleaning performance.
48. Dishwasher Is Leaving Black Marks
Black marks can have several causes, including food residue, rubber or plastic contact, rack damage, or deposits from internal components.
Inspect the rack coating, door gasket, spray arms, and interior.
If the marks appear oily, rubber-like, or metallic, investigate their source rather than simply running additional cleaning cycles.
If you cannot identify the material, stop using the dishwasher until the cause is understood.
49. Dishwasher Is Leaving Rust
Rust may originate from damaged rack coating, exposed metal, or corrosion of another component.
Inspect the racks carefully.
If the protective coating has been damaged and metal is exposed, the rack may require repair or replacement.
Do not use aggressive chemicals to remove rust without checking whether they are safe for the dishwasher.
50. Dishwasher Has Hard-Water Buildup
White, chalky deposits can indicate mineral accumulation.
Hard-water problems can affect:
- Spray arms
- Filters
- Tub surfaces
- Glassware
- Heating components
- Water-softening systems
If your model has a water-softener system, check its settings and salt requirements.
For severe scale, use only a manufacturer-approved descaling method.
51. Dishwasher Is Leaking Under the Sink
If water is visible under the sink near the dishwasher connection, inspect the accessible hose and connection points.
Possible sources include:
- Loose hose connection
- Damaged hose
- Sink connection
- Disposal connection
- Air-gap connection
- Supply connection
If the leak is significant, shut off the water supply and arrange service.
52. Dishwasher Is Leaking From the Bottom
A leak underneath the appliance can be more difficult to diagnose because several internal components may be involved.
Do not continue running repeated cycles to “see if it happens again.”
If water reaches flooring or cabinetry, stop using the dishwasher and have the source identified.
53. Dishwasher Is Filling When Turned Off
This symptom requires particular attention.
If water is entering the dishwasher while the appliance is not running, a water inlet component may not be shutting off properly.
Turn off the dishwasher’s water-supply valve.
If the problem stops when the valve is closed, the dishwasher’s water inlet system should be investigated.
Do not leave the dishwasher connected to an uncontrolled water supply if it is capable of filling while off.
54. Dishwasher Is Overflowing
An overflowing dishwasher should not be treated as an ordinary cleaning issue.
Stop the cycle and shut off the water supply if necessary.
Possible causes include:
- Inlet valve problem
- Float or water-level sensing issue
- Drainage restriction
- Control problem
- Excessive suds
- Installation problem
If the appliance has already overflowed onto the floor, address the water source before attempting additional testing.
55. Dishwasher Has Too Many Suds
Excessive foam can interfere with dishwasher operation and may contribute to leaks.
Dishwashers require products specifically designed for automatic dishwashing.
Do not use ordinary hand dishwashing liquid in the detergent dispenser.
If too much foam is already present, follow the manufacturer’s instructions for clearing it and do not continue adding detergent.
56. Dishwasher Is Foaming After a Cycle
If foam appears unexpectedly, consider whether hand dish soap entered the dishwasher.
Also check whether dishes or utensils were recently washed with hand soap before loading.
Do not add additional detergent.
If the dishwasher continues producing excessive foam, follow the manufacturer’s troubleshooting instructions.
57. Dishwasher Is Not Responding to Buttons
Check whether:
- Control Lock is enabled.
- The display is in Sleep mode.
- A cycle is currently running.
- The door is open.
- An error condition is active.
If controls remain unresponsive, a reset may help in some models.
If the issue repeatedly returns, the control interface or electronic system may require service.
58. Dishwasher Display Is Flickering
A flickering display can be associated with electrical supply problems, control faults, or loose connections.
Do not open the control panel unless qualified.
If the dishwasher is also tripping breakers, producing burning smells, or behaving erratically, stop using it and arrange professional inspection.
59. Dishwasher Trips the Circuit Breaker
Repeated breaker trips should not be treated as a normal troubleshooting problem.
One isolated trip can have several causes, but repeated trips may indicate an electrical fault, wiring issue, heating-component problem, motor problem, or another appliance fault.
Do not repeatedly reset the breaker and continue using the dishwasher.
Have the appliance and electrical supply checked by a qualified professional.
60. Dishwasher Has a Burning Smell
A burning smell is a warning sign.
Stop the dishwasher.
Disconnect power only if this can be done safely.
Do not continue running test cycles.
A burning odor may indicate overheating electrical components, wiring, motors, or other parts.
Professional inspection is appropriate.
61. Dishwasher Has a Plastic-Burning Smell
A melted plastic item can sometimes produce a strong odor.
Inspect the racks and heating area after the appliance has cooled.
If plastic has contacted a heating element, remove it only according to the manufacturer’s instructions.
If the smell continues after removing an obvious melted item, stop using the appliance and arrange service.
62. Dishwasher Is Not Cleaning After Changing Detergent
If the problem started after changing detergent, compare the new detergent with the dishwasher’s recommended detergent types.
Check:
- Dosage
- Water hardness
- Cycle
- Water temperature
- Dispenser condition
Do not assume that a more expensive detergent will compensate for blocked spray arms or a dirty filter.
63. Dishwasher Troubleshooting After Moving House
If the dishwasher worked previously but stopped after moving or installation, check installation-related issues first.
Inspect:
- Power connection
- Water valve
- Supply hose
- Drain hose
- Drain routing
- Sink connection
- Disposal connection
- Air gap
- Leveling
- Door alignment
If the appliance was recently installed, installation errors are more likely than sudden component failure.
64. Dishwasher Troubleshooting After a Kitchen Renovation
Under-sink plumbing changes can affect dishwasher drainage.
If a dishwasher begins backing up after plumbing work, inspect the drain connection and hose routing.
If a new disposal was installed, verify that the dishwasher knockout plug was removed where applicable.
If cabinetry was modified, make sure the drain hose was not crushed behind the appliance.
65. Dishwasher Troubleshooting After a Long Period of Nonuse
A dishwasher that has been unused for weeks or months may develop problems associated with dried residue, stagnant water, or supply conditions.
Before running a full cycle:
- Check the water supply.
- Inspect the drain.
- Check the filter.
- Inspect the interior.
- Check hoses for visible problems.
- Run the appropriate initial or rinse cycle recommended by the manufacturer.
If the dishwasher has been stored or disconnected, follow the manufacturer’s recommissioning instructions.
66. The Best Order for Dishwasher Troubleshooting
When diagnosing a dishwasher, use this order:
Level 1: Simple Checks
- Power
- Door
- Control Lock
- Delay Start
- Water supply
- Error code
Level 2: Cleaning Checks
- Filter
- Spray arms
- Dispenser
- Loading
Level 3: Drainage Checks
- Standing water
- Drain hose
- Sink connection
- Disposal
- Air gap
Level 4: Reset
Perform a manufacturer-approved reset.
Level 5: Professional Diagnosis
Use professional service for:
- Electrical problems
- Repeated breaker trips
- Internal leaks
- Failed pumps
- Failed valves
- Heating faults
- Control-board faults
- Persistent error codes
This order reduces unnecessary work and keeps troubleshooting focused.
67. Dishwasher Troubleshooting Checklist by Symptom
| Problem | First Things to Check |
|---|---|
| Won’t turn on | Power, breaker, controls |
| Has power but won’t start | Door latch, Control Lock, Delay Start |
| Won’t fill | Water valve, supply hose |
| Won’t drain | Filter, pump, drain hose |
| Dirty dishes | Filter, spray arms, loading |
| Dirty upper rack | Upper spray arm, loading |
| Dirty lower rack | Lower spray arm, filter |
| White film | Hard water, detergent |
| Food particles | Filter, spray arms |
| Bad smell | Filter, drain, food debris |
| Poor drying | Rinse aid, cycle, loading |
| Water spots | Rinse aid, water hardness |
| Grinding | Foreign object, pump area |
| Rattling | Dishes, racks, spray arms |
| Leaking | Door seal, hoses, connections |
| Overfilling | Water inlet, float, control |
| Stops mid-cycle | Power, drainage, error code |
| Detergent remains | Dispenser, water temperature, loading |
| Fills while off | Water inlet system |
| Breaker trips | Stop using and seek professional help |
68. Dishwasher Safety Rules During Troubleshooting
Safety should come before diagnosis.
Always follow these principles:
Turn off power before accessing internal electrical or pump components.
Shut off the water supply when working on water connections.
Wear appropriate gloves when inspecting areas where broken glass may be present.
Never put bare fingers into an unknown pump or filter area.
Do not use drain-opening chemicals inside a dishwasher.
Do not mix cleaning chemicals.
Do not bypass safety switches.
Do not continue using a leaking or electrically unsafe appliance.
Manufacturer troubleshooting instructions similarly emphasize disconnecting power and taking care when accessing filters, pumps, and potentially sharp debris.
69. When You Can Troubleshoot the Dishwasher Yourself
Basic troubleshooting is generally appropriate when the problem involves:
- Dirty filter
- Blocked spray arm
- Incorrect loading
- Detergent residue
- Control Lock
- Delay Start
- Closed water valve
- Kinked accessible hose
- Visible food debris
- Basic reset procedures
These are user-level checks commonly addressed by manufacturer support guidance.
70. When You Should Call a Professional
Professional service is appropriate when:
- The dishwasher repeatedly trips the breaker.
- You smell burning.
- The dishwasher has significant electrical damage.
- Water is leaking from an inaccessible internal component.
- The pump has failed.
- The inlet valve appears faulty.
- The heating system is not working.
- The control board is suspected.
- An error code returns after recommended troubleshooting.
- The dishwasher continues filling when switched off.
- The dishwasher repeatedly overfills.
- Internal wiring needs to be inspected.
- You are uncomfortable working with electrical or plumbing components.
The purpose of troubleshooting is not to turn every homeowner into an appliance technician. It is to identify simple problems safely and recognize when professional assistance is appropriate.
71. Dishwasher Troubleshooting Checklist for UK Homes
For UK households, the basic troubleshooting process is the same:
- Check power.
- Check the door.
- Check water supply.
- Check filter.
- Check spray arms.
- Check drainage.
- Check detergent.
- Check rinse aid.
- Check salt and water-softener settings where applicable.
- Check error codes.
- Follow the model-specific manual.
- Use qualified service for electrical or plumbing repairs.
UK dishwasher models may have features and installation arrangements that differ from North American appliances, particularly around water softening and electrical installation.
72. Dishwasher Troubleshooting Checklist for Canadian Homes
Canadian households should follow the same core diagnostic process.
Pay particular attention to water hardness because local water conditions vary substantially.
If the dishwasher has a water-softener system, maintain it according to the manufacturer’s instructions.
During winter or in properties exposed to freezing temperatures, plumbing and appliance water-supply conditions can also require special attention.
For electrical or plumbing work, follow applicable Canadian requirements and use qualified professionals when needed.
73. Dishwasher Troubleshooting Checklist for US Homes
For US households, common checks include:
- Circuit breaker
- Door latch
- Water valve
- Filter
- Spray arms
- Drain hose
- Garbage disposal connection
- Air gap where installed
- Detergent dispenser
- Error code
- Reset procedure
A garbage-disposal connection deserves particular attention after a new dishwasher or disposal installation because the knockout plug must be removed where applicable for dishwasher drainage.
74. How to Prevent Common Dishwasher Problems
Troubleshooting is easier when maintenance is performed regularly.
A preventive routine should include:
- Cleaning the filter according to the manual.
- Checking spray arms.
- Removing large food debris.
- Avoiding overloading.
- Keeping the detergent dispenser clean.
- Maintaining rinse aid.
- Maintaining dishwasher salt where applicable.
- Monitoring hard-water buildup.
- Checking the door gasket.
- Inspecting the drain area.
- Keeping the drain hose correctly routed.
Regular maintenance is specifically recommended by manufacturers as a way to maintain dishwasher performance and reduce problems associated with debris and blocked components.
75. Dishwasher Troubleshooting Checklist Before Calling for Service
Before contacting a technician, write down:
- Dishwasher brand
- Exact model number
- Approximate age
- Problem description
- When the problem started
- Error code
- Whether water enters
- Whether water drains
- Whether dishes are clean
- Whether dishes dry
- Whether unusual sounds occur
- Whether there are leaks
- Whether the breaker trips
- What troubleshooting steps you already performed
This information can help the technician diagnose the problem more efficiently.
76. Final Dishwasher Troubleshooting Checklist
When your dishwasher develops a problem, do not immediately assume that an expensive part has failed.
Start with the basics.
Check the power.
Check the door.
Check the controls.
Check the water supply.
Check the filter.
Check the spray arms.
Check loading.
Check detergent.
Check drainage.
Check hoses.
Check the sink or disposal connection.
Check error codes.
Then perform a manufacturer-approved reset if appropriate.
If the problem remains, determine whether it is safe to continue using the appliance.
A dishwasher that leaves dishes dirty may only need filter cleaning or better loading. A dishwasher that does not drain may have a blocked filter or hose. A dishwasher that does not fill may have a closed water valve. A dishwasher that refuses to start may have a door-latch or control setting issue.
At the same time, some symptoms require immediate professional attention. Electrical burning smells, repeated breaker trips, serious leaks, uncontrolled filling, and major internal faults should not be treated as routine DIY maintenance.
The most effective troubleshooting strategy is therefore simple checks first, component checks second, professional diagnosis when necessary.
Keeping a regular maintenance routine also reduces the likelihood of many common problems. Filters, spray arms, drainage paths, detergent dispensers, door seals, and water-softening systems all deserve periodic attention.
For households in the UK, USA, and Canada, the exact maintenance schedule and repair procedures can differ depending on the dishwasher model, installation method, water conditions, and local requirements. Always use the owner’s manual as the final authority for model-specific instructions.
Frequently Asked Questions About Dishwasher Troubleshooting
Why is my dishwasher not starting?
Check the power supply, circuit breaker, door latch, Control Lock, Delay Start, and water supply. If the dishwasher has power but remains unresponsive, a control or door-switch problem may require service.
Why is my dishwasher not draining?
The most common checks are the filter, pump area, drain hose, sink connection, garbage-disposal connection, and air gap if installed. Food debris and hose restrictions are common causes.
How do I fix a dishwasher that has water in the bottom?
First determine whether the water is a small amount of normal residual water or substantial standing water. If there is significant water, inspect and clean the filter, check the pump area, inspect the drain hose, and check the sink or disposal connection.
Why does my dishwasher fill with water but not wash?
Possible causes include circulation-pump problems, control issues, water-level problems, or other mechanical faults. First confirm that the dishwasher is actually filling and that the spray arms are not obstructed.
Why is my dishwasher not filling with water?
Check the water-supply valve and supply hose first. A closed valve or kinked hose can prevent filling. If the water supply is correct, an inlet valve, float, door switch, or control problem may be involved.
Why does my dishwasher run without water?
Check the water supply and inlet hose. If water is available but does not enter the machine, the inlet valve, float system, door switch, or controls may require diagnosis.
Why does my dishwasher stop halfway through a cycle?
Check whether the door was opened, whether there was a power interruption, whether the dishwasher can drain, and whether an error code is displayed.
Why is my dishwasher not cleaning dishes?
Clean the filter, inspect the spray arms, check loading, verify detergent use, and make sure large dishes are not blocking water circulation. These are among the first checks recommended in manufacturer troubleshooting guidance.
Why are my dishes still dirty after the dishwasher runs?
A dirty filter, blocked spray arms, incorrect loading, detergent problems, unsuitable cycle selection, or water-temperature issues can all contribute to poor cleaning.
Why does my dishwasher leave food particles?
Food particles can accumulate in the filtration system or remain in the wash system if the filter is blocked or water circulation is restricted. Clean the filter and inspect the spray arms.
Why is my dishwasher leaving white residue?
White residue may be caused by hard-water minerals, detergent residue, or water-softening issues. Check your water hardness and dishwasher settings.
Why does my dishwasher leave detergent on dishes?
Check detergent quantity, dispenser operation, water temperature, spray-arm movement, and loading. Excess detergent can also contribute to residue.
Why does my dishwasher tablet not dissolve?
The dispenser may be blocked by a dish, the dispenser may contain buildup, or the dishwasher may not be receiving suitable water conditions. Check the dispenser and spray arms first.
Why does my dishwasher smell bad?
A dirty filter, trapped food, standing water, drain problems, or residue around the door and spray arms can cause odors. Start by cleaning the filter and checking drainage.
Why does my dishwasher smell like sewage?
Check the drain hose, sink connection, air gap, and wastewater routing. A persistent sewage smell may indicate a drainage or plumbing problem rather than simply a dirty dishwasher.
Why is my dishwasher making a grinding noise?
A foreign object such as broken glass or hard debris may have entered the pump area. Stop the appliance and inspect it safely according to the manufacturer’s instructions.
Why is my dishwasher making a rattling noise?
Check dishes, utensils, racks, and spray arms. If the noise occurs when the dishwasher is empty, a mechanical component may require inspection.
Why is my dishwasher leaking?
Check the door gasket, door alignment, hose connections, water supply, drain connections, and dishwasher leveling. Significant or internal leaks should be professionally diagnosed.
Why is my dishwasher overflowing?
Potential causes include water inlet problems, water-level sensing issues, drainage restrictions, control problems, or excessive suds. Stop the dishwasher and shut off the water supply if necessary.
Why is my dishwasher filling with water when it is off?
Water entering while the appliance is switched off can indicate a problem with the water inlet system. Shut off the dishwasher’s water-supply valve and arrange service if the problem persists.
Why is my dishwasher not drying dishes?
Check rinse aid, cycle settings, loading, and the dishwasher’s drying technology. Plastic items may naturally retain more water than glass or ceramic dishes.
Why are my glasses covered in water spots?
Minerals in the water and insufficient rinsing performance can produce spots. Rinse aid and appropriate water-softener settings can help manage this issue.
Can a dirty dishwasher filter cause problems?
Yes. A dirty or blocked filter can contribute to poor cleaning, food redeposition, odors, and drainage problems.
How often should I clean my dishwasher filter?
Follow the manufacturer’s recommended schedule. Households that run many loads or allow more food debris into the dishwasher may need to inspect the filter more frequently.
Should I reset my dishwasher?
A reset can sometimes clear a temporary electronic control issue, but it will not repair a blocked drain, failed pump, leaking valve, or damaged component. Use the model-specific reset procedure.
How long should I unplug my dishwasher to reset it?
There is no universal interval for every dishwasher. Some manufacturer instructions specify a short power interruption, such as around 30 seconds. Follow the instructions for your model.
What should I do if my dishwasher keeps tripping the breaker?
Stop using the dishwasher and have it professionally inspected. Repeated breaker trips can indicate an electrical or appliance fault.
What should I do if my dishwasher smells like burning?
Stop using the dishwasher. A burning smell can indicate overheating or an electrical fault. Do not continue running test cycles.
Can I use drain cleaner in my dishwasher?
Do not use household drain-opening chemicals inside a dishwasher unless the manufacturer specifically instructs you to do so. Such chemicals can damage appliance components and create safety hazards.
Should I pre-rinse dishes before putting them in the dishwasher?
Generally, remove large food particles rather than fully washing dishes under running water. Modern dishwashers are designed to clean normally soiled dishes, and manufacturer guidance recommends scraping rather than unnecessary pre-rinsing.
Why is my newly installed dishwasher not draining?
Check the drain hose, hose routing, sink connection, air gap if installed, and garbage-disposal knockout plug where applicable. Installation-related drainage issues are especially important to check on a newly installed dishwasher.
Why does my dishwasher have water after installation?
Check whether the drain hose is correctly routed and connected. A missing high loop, blocked connection, or retained disposal knockout plug can interfere with drainage depending on the installation.
How do I know whether my dishwasher needs professional repair?
Professional repair is appropriate for electrical faults, repeated breaker trips, serious leaks, burning smells, uncontrolled filling, internal component failures, persistent error codes, or problems that remain after basic manufacturer-recommended troubleshooting.
What is the first thing I should check when my dishwasher stops working?
Check power, the door latch, control settings, water supply, and error display. These basic checks can identify several common causes without disassembling the appliance.
What is the most common dishwasher troubleshooting mistake?
The biggest mistake is replacing parts before checking simple causes such as a blocked filter, obstructed spray arm, kinked drain hose, closed water valve, incorrect loading, or a control setting.
Can troubleshooting damage my dishwasher?
It can if components are forced, electrical panels are opened incorrectly, sharp debris is handled carelessly, or inappropriate chemicals are used. Follow model-specific instructions and stop when a repair goes beyond basic maintenance.
Is dishwasher troubleshooting the same in the UK, USA, and Canada?
The fundamental checks are similar, but models, plumbing arrangements, electrical systems, water hardness, installation requirements, and available features vary. Always follow the instructions supplied with the specific appliance and applicable local requirements.
