My dishwasher isn't cleaning properly. What are the first things I should check before calling for a repair?

Yes. Before calling for a repair, I’d check these in roughly this order. These are common causes across major dishwasher brands.

1. Clean the filter

   • Remove the filter from the bottom of the tub according to your manual.
   • Rinse it under warm water and gently scrub off trapped food/debris.
   • A clogged filter can circulate dirty water back onto the dishes.

2. Check the spray arms

   • Make sure they spin freely and aren't hitting plates, utensils, or the racks.
   • Inspect the little spray holes for food particles or mineral buildup and clean them out.
   • Blocked spray arms are a very common cause of poor cleaning.

3. Look at how you're loading it

   • Don't nest bowls or stack plates so tightly that water can't reach them.
   • Keep large pans from blocking the spray arms or detergent dispenser.
   • Put heavily soiled surfaces facing toward the spray jets.

4. Check the detergent

   • Use detergent specifically made for dishwashers.
   • Make sure the dispenser isn't blocked and actually opens.
   • If detergent is caked up or old, replace it.
   • Don't simply use more detergent; the correct amount depends on the detergent and your machine/water conditions.

5. Make sure the water is hot

   • Run the kitchen faucet until the water is hot before starting the dishwasher.
   • Incoming water around 120°F (49°C) is commonly recommended for effective cleaning; check your dishwasher's manual for its specification.

6. Check the cycle

   • Make sure you haven't accidentally selected a rinse-only, quick, or top-rack-only cycle when you need a normal/heavy wash. Some shorter cycles aren't designed for heavily soiled dishes.

7. Run an empty hot cycle

   • After cleaning the filter and spray arms, run an empty cycle on the hottest appropriate setting. This can help remove accumulated grease/mineral residue.

When I'd call for repair

If you've done those checks and the spray arms still don't rotate, the dishwasher isn't filling with enough water, the water isn't heating, the detergent dispenser doesn't open, there's standing water after a cycle, or you're getting an error code, it's more likely you're dealing with a component or plumbing problem rather than a simple maintenance issue.

If you tell me the brand and model number of your dishwasher—and what exactly is happening (food left on dishes, white film, dishes still greasy, poor cleaning only on the top/bottom rack, etc.)—I can walk you through the model-specific checks.

Here are the first things you should check to troubleshoot a dishwasher that isn't cleaning properly before paying for a repair service:

• Filter and sump area: Pull out the bottom rack and locate the cylindrical or flat filter at the bottom of the tub. Twist and pull it out, then wash away food debris, grease, and buildup under running water with a soft brush.
• Spray arms: Inspect the rotating spray arms (top and bottom) for clogs. Food particles or mineral scale can block the tiny water jets. Use a toothpick or a piece of wire to poke any trapped debris out of the holes, and make sure the arm spins freely.
• Water temperature: Dishwashers need hot water—ideally 120°F (49°C) to 140°F (60°C)—to melt grease and activate detergent. Run the kitchen sink hot water tap right before starting the cycle to ensure hot water is already in the pipes.
• Loading technique: Overcrowding or blocking the spray arms prevents water and detergent from reaching the dishes. Ensure tall items aren't blocking the detergent dispenser door from popping open, and place plates facing inward and downward.
• Detergent quality and freshness: Old or clumped detergent loses its enzymatic power. Switch to a fresh box or pods, and make sure you aren't under-dosing or over-dosing. If you have hard water, using a rinse aid (like Finish) can dramatically improve drying and spotting issues.
• Air gap or garbage disposal connection: If the drain hose connected to your sink's air gap or garbage disposal is clogged, dirty water can pool back into the bottom of the dishwasher during the wash cycle. Ensure your disposal is completely clear and the knockout plug was removed if it's a new installation.

If you want, tell me:

• What kind of residue or issue you are seeing (e.g., white film, gritty food particles, or dishes still greasy)?
• Does it drain fully at the end of the cycle?

I can help narrow down the exact culprit.

Before calling for a repair, check the common causes that you can usually fix yourself. Most poor cleaning issues come from blocked water flow, loading problems, detergent issues, or water temperature problems.

1. Clean the dishwasher filter

   • Remove the bottom rack.
   • Find the filter assembly at the bottom of the tub.
   • Remove it according to your model’s instructions and rinse away food debris or grease.
   • A clogged filter can cause dirty water to recirculate onto clean dishes.

2. Check the spray arms

   • Spin the spray arms by hand; they should rotate freely.
   • Inspect the small spray holes for food particles or mineral buildup.
   • Clear blocked holes with a toothpick or soft brush if needed.

3. Make sure dishes aren’t blocking the spray

   • Avoid overcrowding.
   • Make sure tall pans, cutting boards, or utensils aren’t stopping the spray arms from turning.
   • Face dirty surfaces toward the spray jets rather than nesting bowls tightly together.

4. Check the detergent

   • Confirm you’re using dishwasher detergent, not regular dish soap.
   • Try fresh detergent if yours is old, damp, or clumped.
   • Don’t assume more detergent is better—too much can leave residue.

5. Verify hot water is reaching the dishwasher

   • Run the kitchen faucet until it’s hot before starting a cycle.
   • If dishes are greasy or detergent isn’t dissolving, low water temperature may be a factor.

6. Check the wash cycle

   • A quick or light cycle may not handle heavily soiled dishes well.
   • Try a normal/heavy cycle with a properly loaded test load.

7. Look for obvious water or drainage problems

   • Make sure the dishwasher is filling with water.
   • Check that the bottom isn’t holding dirty water after a cycle.
   • Listen for unusual grinding, humming, or repeated clicking noises.

If it still cleans poorly after cleaning the filter and spray arms, the next likely causes include a failing circulation pump, water inlet issue, heating problem, or a detergent dispenser problem.

If you tell me the brand/model, what’s wrong with the dishes (food stuck, cloudy film, greasy, not drying, top rack dirty, etc.), and whether the dishwasher is new or older, I can narrow it down.

• Filter: Check the bottom of the tub for a removable cylindrical or flat mesh filter. Twist and pull it out, then wash away trapped food particles, grease, and debris under warm running water using a soft brush.
• Spray arms: Inspect the rotating spray arms for blocked or clogged water jets. Use a toothpick, pin, or piece of wire to poke out any trapped food bits, hard water deposits, or lime scale, and make sure the arms spin freely without hitting any dishes.
• Water inlet valve & temperature: Ensure your home's hot water heater is set to at least 120°F (49°C) and run the kitchen sink tap until it turns hot right before starting a cycle so the dishwasher gets hot water immediately.
• Loading technique: Review how you load your dishes to ensure large plates or bowls aren't blocking the detergent dispenser door or preventing the lower spray arm from spinning properly.
• Detergent quality: Check if your detergent is old, clumped, or expired, which degrades its enzyme effectiveness, and switch to a fresh, high-quality pod or liquid if needed.
• Air gap / Drain hose: Look under your sink to make sure the drain hose isn't kinked or crushed, and check the high loop or air gap (if your local plumbing uses one) for clogs that could cause dirty water to flow back into the tub.

If you want to troubleshoot further, tell me:

• Are the dishes coming out gritty/filmy or still covered in stuck-on food?
• Is there standing water left at the bottom of the tub after a cycle finishes?

Before calling for repair, I’d check these in roughly this order:

1. Clean the filter.
   Pull out the lower rack and remove the filter at the bottom. Rinse it under warm water and gently scrub off food debris with a soft brush. A clogged filter is one of the most common causes of poor cleaning.

2. Check the spray arms.
   Make sure they spin freely and aren't hitting a plate, pot, or utensil. Look for clogged holes and rinse/clean them if necessary.

3. Look at how you're loading it.
   Don't nest bowls or plates tightly together, and keep tall items from blocking the spray arms or detergent dispenser. Put the dirty surfaces facing the spray jets.

4. Check the detergent.
   Make sure you're using automatic-dishwasher detergent, not hand dish soap. Don't overfill the dispenser, and check that its door isn't blocked from opening. If you use tablets and they're repeatedly left partly dissolved, that's a useful clue.

5. Make sure the incoming water is hot.
   Run the kitchen faucet's hot water for about 30 seconds before starting the dishwasher. Many manufacturers recommend water entering the dishwasher at roughly 120°F (49°C) or higher for good cleaning.

6. Try a stronger cycle.
   If you've been using Quick, 30-minute, or similar cycles, try Normal/Heavy with a reasonably full load. Short cycles may not handle heavily soiled dishes well.

7. Check for standing water or obvious drainage problems.
   After a cycle, there shouldn't be a significant amount of dirty water sitting in the bottom. Also look under the sink for a kinked drain hose.

8. If there's white/chalky residue, consider hard-water buildup. Mineral deposits can clog spray-arm holes and affect cleaning.

When I'd call for repair

If you've cleaned the filter and spray arms, loaded it correctly, confirmed hot water and detergent, and it still isn't spraying/cleaning properly, the problem may involve the circulation pump, water-inlet system, diverter, heater, or another internal component.

One particularly useful clue: if you tell me whether the dishes are coming out dirty, greasy, gritty, wet, or with detergent still in the dispenser, plus your dishwasher's brand/model, I can narrow down the likely cause and tell you what to check next.

Here is a quick-check list of the most common, easy-to-fix culprits before you call a technician:

• Filter Remove the bottom rack and locate the filter assembly at the base of the tub. Twist and pull it out, then wash away trapped food particles, grease, and debris under warm running water. A clogged filter severely reduces water circulation.
• Spray arms Inspect the rotating spray arms (top and bottom) for clogged holes or blockages from hard water scale or food debris. You can use a toothpick or a piece of wire to clear out any blocked nozzles, and make sure they spin freely without hitting dishes.
• Water inlet valve Check that the water supply valve (usually located under the kitchen sink connected to the dishwasher hose) is fully open and that the supply hose isn't kinked or pinched behind the unit.
• Detergent dispenser Ensure the dispenser cup isn't blocked by a large plate or utensil, which prevents the door from popping open during the cycle. Also, check that your detergent isn't clumped, old, or damp.
• Load configuration Make sure tall items aren't blocking the spray arms from spinning or shielding other dishes from the water jets. Avoid overcrowding, and load plates facing inward toward the center.
• Water temperature Run the kitchen sink faucet closest to the dishwasher until the water turns hot before starting a cycle. Dishwashers need incoming water around 120° F to properly dissolve grease and activate modern detergents.

If you want to troubleshoot further, tell me:

• What kind of residue or issue are you seeing (e.g., white film, food particles left on top-rack items, or dishes still wet)?
• Does the water at the bottom drain fully at the end of the cycle?

I can give you a more targeted fix based on those details.

Here are the first things you should check to troubleshoot a dishwasher that isn't cleaning properly before paying for a repair:

• Filter Remove the bottom rack and locate the filter assembly at the bottom of the tub. Twist and pull it out, then wash away trapped food debris, grease, and slime using warm soapy water and a soft brush before clicking it back into place.
• Spray Arms Inspect the upper and lower rotating spray arms for clogs. Food particles or mineral buildup (hard water scale) can block the tiny water jets. Use a toothpick or a piece of wire to clear out any blocked holes, and make sure the arms spin freely without hitting dishes.
• Water Inlet Valve & Supply Ensure the water supply valve under your sink is fully open. If the dishwasher isn't getting enough water—measured as V f i l l cap V sub f i l l end-sub𝑉𝑓𝑖𝑙𝑙 or adequate volume—the spray arms won't have enough pressure to wash effectively.
• Loading Technique Check if large items or baking sheets are blocking the lower spray arm from spinning or preventing the detergent dispenser door from popping open. Avoid overcrowding or nesting silverware together.
• Detergent Quality & Dispenser Make sure the dispenser cup is completely dry before adding fresh detergent, as moisture causes powder or tabs to clump up before the wash cycle starts. If you use pods, ensure your cycle is long enough for them to fully dissolve.
• Water Temperature Run the kitchen sink hot water tap right before starting the dishwasher so the water entering the appliance is already hot (ideally around 120° F to 140° F). Cold water drastically reduces the effectiveness of dish soap and grease breakdown.

If you want to narrow down the issue, tell me:

• What kind of residue is left on the dishes (white film, grease, or gritty food particles)?
• Are you using liquid, powder, or tabs/pods for your detergent?

I can give you a more specific fix based on those details.

Before calling for a repair, I’d check these in roughly this order:

1. Clean the filter.
   Remove the filter from the bottom of the tub and rinse it under warm water. Food debris trapped there can get recirculated onto dishes. Follow your owner’s manual for removal because designs vary.

2. Inspect the spray arms.
   Make sure the upper and lower arms spin freely and that their little spray holes aren't clogged with food or mineral buildup. Rinse them and clear blocked holes with a toothpick or soft brush.

3. Check how you're loading it.
   Don't let plates, pans, utensils, or tall items block the spray arms or detergent dispenser. Avoid nesting dishes together; dirty surfaces should face toward the spray.

4. Check the water temperature.
   Run the kitchen faucet until the water is hot before starting the dishwasher. Around 120°F (49°C) is a common target for incoming water. If the water is consistently cool, that can prevent detergent from working effectively.

5. Check the detergent dispenser.
   Make sure the dispenser actually opens and isn't blocked by a dish or utensil. Use fresh dishwasher detergent and don't overfill it. If you're finding detergent still sitting in the cup afterward, that's an important clue.

6. Check rinse aid and the cycle setting.
   Rinse aid can help with cloudy glassware and drying, while a quick/rinse cycle may simply be inadequate for heavily soiled dishes.

7. Run an empty hot cycle.
   After cleaning the filter and spray arms, run the dishwasher empty on its strongest/hottest appropriate cycle. This can help clear buildup and lets you see whether the machine itself is circulating water normally.

Signs it's probably time for a repair

If the spray arms aren't turning, the dishwasher isn't filling with enough water, the water stays cold despite a hot-water supply, the detergent dispenser won't open, or you hear unusual grinding/buzzing—or there's an error code—then a failed valve, circulation pump, heater, sensor, or related component becomes more likely.

If you tell me what's wrong with the dishes specifically (food still stuck, cloudy film, greasy, detergent left in the dispenser, only the top/bottom rack dirty, etc.) and the dishwasher brand/model, I can narrow it down considerably.

Before calling a repair tech, try these checks—in roughly this order:

1. Clean the filter.
   Remove the filter(s) from the bottom of the tub and rinse away food debris and buildup. A clogged filter is one of the most common causes of poor cleaning. Follow your model's manual for removal instructions.

2. Check the spray arms.
   Spin each arm by hand. They should move freely and not hit plates, utensils, or the rack. Check the small spray holes for food particles or mineral buildup and clean them if blocked.

3. Look at how you're loading it.
   Don't overcrowd dishes, and make sure dirty surfaces face inward/down toward the spray arms. Large items shouldn't block the detergent dispenser or spray arms.

4. Make sure it's getting hot water.
   Run the kitchen faucet until the water is hot before starting the dishwasher. Many dishwashers perform best with incoming water around 120°F (49°C).

5. Check the detergent.
   Use fresh dishwasher detergent—not regular dish soap—and make sure the dispenser can open fully. Old/clumped detergent or a dispenser blocked by a dish can leave dishes dirty.

6. Check the cycle you're using.
   If you're washing heavily soiled or baked-on food, try a heavier/High-Temp cycle rather than a quick or light cycle.

7. Look for drainage problems.
   After a completed cycle, there shouldn't be a significant amount of dirty water sitting in the bottom. If there is, check the filter/drain area for debris and, if accessible, look for a kinked drain hose.

When I'd call for repair

If the filter and spray arms are clean, loading/detergent are correct, hot water is reaching the machine, and it still isn't washing well, the problem may involve the circulation pump, heating element/sensor, water inlet, or another internal component. At that point, a technician is reasonable—especially if you hear unusual noises, see an error code, or the dishwasher isn't filling/draining normally.

If you tell me what's actually happening (food left on dishes, cloudy glasses, dishes cold/wet, water left in bottom, etc.) and your dishwasher's brand/model, I can narrow it down to the most likely cause.

• Filter: Check the bottom of the tub for the cylindrical or flat mesh filter. Remove it, wash it under warm water with a brush to clear out trapped food particles, grease, and debris, and click it firmly back into place.
• Spray arms: Inspect the upper and lower rotating spray arms. Make sure the tiny water jets aren't clogged with hard water scale, food bits, or toothpicks. You can clear blocked holes using a toothpick or a piece of wire.
• Water temperature: Run the kitchen sink faucet closest to the dishwasher until the water runs hot before starting a cycle. Dishwashers typically need incoming water around 120°F (49°C) to properly dissolve detergent and melt grease.
• Loading technique: Ensure large dishes, bowls, or pots aren't blocking the spray arms from spinning freely or blocking the detergent dispenser door from popping open during the wash cycle.
• Air gap / Drain hose: Check underneath your sink to see if the high loop of the drain hose or the air gap on the sink is clogged, which can cause dirty water to flow back into the bottom of the dishwasher.
• Detergent quality: Verify you are using fresh, high-quality detergent. Old or clumped detergent loses its enzymatic power, and running out of rinse aid can leave cloudy film or water spots on your glassware.

If you want to narrow this down further, tell me:

• What specific problem you are seeing (e.g., a white film, gritty food left on plates, or standing water at the bottom)?
• The brand or model type of your dishwasher?

I can give you a more targeted troubleshooting step.