On this page
Quick answer
Start by checking the spray arms for clogs and the filter for debris. Ensure you're using the right detergent and water temperature. Run a cleaning cycle if needed.
Confirm the symptom
- Dishes still have food particles after a cycle
- Water spots or streaks on glassware
- Dishes feel only partially cleaned
- Spray arms aren't spinning freely
- You've tried multiple detergent brands without improvement
Tools and prep
- Screwdriver (if needed for access panels)
- Soft brush or toothbrush
- White vinegar or dishwasher cleaner
- Clean cloth or paper towels
- Gloves (optional for cleaning)
- Ensure the dishwasher is unplugged or power is off at the circuit breaker
- Turn off water supply if removing parts
Step-by-step troubleshooting
- Inspect Spray ArmsDo: Remove the spray arms and check for clogged holes using a toothpick or pin.Observe: Clogged holes or buildup in the spray arm.Means: Blocked water flow prevents proper cleaning.Next: Clean the spray arms thoroughly and reattach.
- Check and Clean the FilterDo: Locate the filter at the bottom of the dishwasher and remove it. Clean it under running water.Observe: Food debris or buildup in the filter.Means: A dirty filter reduces water circulation and cleaning efficiency.Next: Replace the filter if it's damaged or worn.
- Verify Detergent UseDo: Check if you're using the correct type and amount of dishwasher detergent.Observe: Using too little detergent or the wrong type.Means: Inadequate detergent can lead to poor cleaning performance.Next: Use a high-quality detergent recommended for your dishwasher model.
- Test Water TemperatureDo: Ensure the water entering the dishwasher is at least 120°F (49°C).Observe: Cold or lukewarm water during operation.Means: Cold water doesn't dissolve detergent properly or sanitize dishes.Next: Adjust your home's water heater settings if necessary.
- Run a Cleaning CycleDo: Place a cup of white vinegar in a dishwasher-safe container on the top rack and run a hot water cycle without dishes.Observe: Foul odors or residue being removed during the cycle.Means: Mineral buildup or mold can affect cleaning performance.Next: Repeat if necessary or use a commercial dishwasher cleaner.
- Check for Obstructed DishesDo: Ensure dishes are properly loaded and not blocking the spray arms or each other.Observe: Dishes stacked too tightly or blocking spray arms.Means: Poor water circulation leads to uneven cleaning.Next: Rearrange dishes for better water flow.
- Inspect the Dishwasher's InteriorDo: Look for signs of mold, mildew, or hard water buildup on the interior surfaces.Observe: Visible mold or buildup on racks or walls.Means: These can interfere with water flow and cleaning effectiveness.Next: Clean the interior with a mixture of vinegar and water or a dishwasher cleaner.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Spray Arms Blocked spray arm holes prevent water from reaching all dishes. | Common | Easy | Spray arms (if damaged) |
| Dirty Filter A clogged filter restricts water flow and traps debris that should be flushed away. | Common | Easy | Dishwasher filter |
| Incorrect Detergent Using the wrong detergent or too little can lead to poor cleaning and residue. | Common | Easy | Dishwasher detergent |
| Low Water Temperature Cold water doesn't dissolve detergent properly or sanitize dishes effectively. | Sometimes | Easy | Water heater adjustment |
| Hard Water Buildup Mineral deposits from hard water can reduce water flow and leave spots. | Sometimes | Easy–Medium | Water softener or rinse aid |
| Poor Loading Practices Overloading or improper placement blocks water from reaching dishes. | Sometimes | Easy | None |
| Faulty Water Inlet Valve A malfunctioning valve may not provide enough water for proper cleaning. | Rare | Medium | Water inlet valve |
| Worn Seals or Hoses Leaking seals or hoses can reduce water pressure and flow. | Rare | Medium | Seals or hoses |
| Malfunctioning Circulation Pump A faulty pump can't circulate water effectively, leading to poor cleaning. | Rare | Hard | Circulation pump |
| Control Board Issues A faulty control board may not activate the cleaning cycle properly. | Rare | Hard | Control board |
Parts matching
If you need to replace parts, match these common issues to the right components:
- Clogged spray arms → Replace or clean spray arms
- Dirty filter → Replace or clean filter
- Low water pressure → Check water inlet valve
- Hard water spots → Use rinse aid or water softener
- Poor water flow → Inspect circulation pump or hoses
Always refer to your dishwasher's manual for part-specific details and compatibility.
When to call a professional
- After cleaning all parts and adjusting settings, the dishwasher still doesn't clean well
- You suspect a faulty water inlet valve, circulation pump, or control board
- You're uncomfortable working with electrical components or water supply lines
- The dishwasher is under warranty and you don't want to risk voiding it
- You've tried all troubleshooting steps without success
FAQ
How often should I clean my dishwasher filter?
Clean the filter every 1–2 months to maintain good water flow and cleaning performance.
Can I use regular dish soap in my dishwasher?
No, regular dish soap can create excessive suds and damage the dishwasher. Always use dishwasher-specific detergent.
Why are there white spots on my dishes after washing?
White spots are usually caused by hard water buildup. Use a rinse aid or water softener to reduce this issue.
What water temperature is best for dishwashers?
The water entering the dishwasher should be at least 120°F (49°C) for optimal cleaning and sanitization.
How do I know if my dishwasher's circulation pump is faulty?
If water isn't circulating properly and dishes aren't getting clean, the circulation pump may be the issue. A professional can test and replace it if needed.