Hums right after you press Start
You hear a low hum or buzz, but when you open the door after a minute the bottom is still mostly dry.
Start here: Check the water shutoff, supply line, and dishwasher float first.
Dishwasher fill problem
Dishwasher Hums but No Water? Start Here
Direct answer: If your dishwasher is making noise but no water is coming in, the most common causes are a closed or restricted water supply, a stuck dishwasher float, or a dishwasher water inlet valve that is humming but not opening.
Most likely: Start by confirming the sink shutoff is fully open, the supply line is not kinked, and the dishwasher float moves freely. Those checks solve this more often than people expect.
Listen to the kind of noise you have. A steady hum right after start usually means the machine is trying to fill. A drain sound first can be normal for a short time. Reality check: many dishwashers drain briefly at the beginning of a cycle before they try to fill. Common wrong move: replacing a drain part when the real problem is a shut water valve or a float stuck in the up position.
Don’t start with: Do not start by ordering a pump or control board. A dishwasher can sound alive and still be dry because it never got water in the first place.
If you hear a brief drain sound firstLet it run for a minute, then check whether water actually enters the tub.
If it only hums and stays dryCheck the water supply and float before suspecting an internal part.
Last reviewed: 2026-04-30
What this usually looks and sounds like
Sounds like it is draining but never washing
The dishwasher makes a drain or pump sound at the beginning, then never seems to move into a normal wash with water sloshing inside.
Start here: Give it a minute, then confirm whether it ever fills. If not, focus on fill controls, not drain parts.
Clicks or starts, then sits there dry
The cycle begins, lights look normal, but there is no splash sound and detergent may stay mostly dry.
Start here: Make sure the door is fully latching and the float is not stuck up.
Buzzing gets louder, then stops
You hear the machine trying, but no water enters and the cycle may pause or end early.
Start here: Look for a restricted supply line or a dishwasher water inlet valve that is energized but not opening.
Most likely causes
1. Water supply to the dishwasher is shut off or restricted
A dishwasher can power up, drain, and hum normally even when the under-sink shutoff is partly closed, fully closed, or the supply line is kinked.
Quick check: Find the dishwasher water shutoff under the sink or nearby cabinet, make sure it is fully open, and inspect the supply line for a sharp bend or crush point.
2. Dishwasher float is stuck in the full position
If the dishwasher float is jammed high by debris or soap residue, the machine thinks it already has enough water and will not open the fill valve.
Quick check: Open the tub and gently lift and lower the float. It should move freely and drop back down without sticking.
3. Dishwasher door latch is not fully engaging
Some dishwashers will power on and make partial startup noises, but they will not allow a normal fill if the door latch is not proving closed.
Quick check: Close the door firmly and listen for a solid latch. If you have to push hard on one corner to make it start, the latch is suspect.
4. Dishwasher water inlet valve is failing or blocked
A weak or failed dishwasher water inlet valve often hums or buzzes when energized but does not let water into the tub.
Quick check: After the easy checks, listen near the lower front area during the fill portion. A steady hum with no water entering points toward the valve or supply blockage.
Step-by-step fix
Step 1: Confirm it is actually failing to fill, not just doing the normal startup drain
A lot of homeowners hear the first pump noise and assume something is wrong, but many dishwashers drain briefly before they fill.
- Start a normal cycle with the dishwasher empty.
- Listen for the first 30 to 60 seconds.
- Open the door after about a minute and look at the sump area in the bottom of the tub.
- If you see a shallow pool of clean water in the bottom, it did fill at least partway.
- If the tub is still dry or nearly dry, continue with fill checks.
If that issue is confirmed: Dishwasher keeps draining
What to conclude: This separates a normal startup sound from a true no-water condition.
Stop if:
- You see water leaking under the dishwasher or into the cabinet.
- The dishwasher makes a harsh grinding or burning smell instead of a normal hum.
- The breaker trips when the cycle starts.
Step 2: Check the dishwasher water supply shutoff and supply line
This is the fastest real-world fix. Under-sink valves get bumped during other plumbing work, and soft copper or braided lines can kink when items are shoved back into the cabinet.
- Turn off power to the dishwasher at the breaker before reaching around tight wiring or connections under the sink.
- Locate the dishwasher water shutoff valve, usually on the hot water side under the sink or in the adjacent cabinet.
- Make sure the valve is fully open.
- Inspect the dishwasher water supply line for a kink, flattening, or obvious leak.
- If the line looks pinched where the dishwasher was pushed back, do not force it further; note the pinch point for correction.
- Restore power and test the dishwasher again.
Next move: If the dishwasher fills normally now, the issue was a closed valve or restricted supply line. If the supply is open and the line looks good but the tub still stays dry, check the float and door latch next.
What to conclude: A good-looking machine cannot fill without actual water available at the inlet.
Step 3: Free up the dishwasher float and make sure the door is truly latching
These are common no-fill lockouts that do not require buying parts unless you confirm they are damaged.
- Open the dishwasher and find the dishwasher float in the tub floor area.
- Lift it gently and let it drop. It should move smoothly and settle fully down.
- Clean away food bits, scale, or soap buildup around the float with warm water and mild dish soap on a cloth.
- Do not force the float stem sideways.
- Close the door and latch it firmly.
- If the door feels loose, pops back, or only starts when you press on it, note that as a latch clue and test again.
Next move: If the dishwasher fills after freeing the float or closing the door firmly, you found the problem. If the float moves freely and the door closes well but there is still no fill, the inlet valve becomes more likely.
Step 4: Listen for a fill-valve hum and decide whether the dishwasher water inlet valve is the likely failure
Once the supply, float, and latch checks are done, the remaining common cause is the part that actually opens to let water in.
- Start a cycle again and stand near the lower front of the dishwasher during the fill portion.
- Listen for a steady hum or buzz for several seconds with no water entering the tub.
- If you hear that hum and the supply is confirmed on, the dishwasher water inlet valve is a strong suspect.
- If there is no hum at all and the door latch has been acting up, the latch branch stays in play.
- If the float was sticky or damaged, the float assembly branch stays in play.
Next move: If the sound pattern clearly matches a humming valve with no fill, you have a supported replacement path. If the sound pattern is unclear or inconsistent, stop short of guess-buying parts and consider a service diagnosis.
Step 5: Replace the confirmed failed part or call for service if the diagnosis is still muddy
By this point you should have narrowed it to a real fill problem with a likely cause instead of swapping random parts.
- If the dishwasher water inlet valve hums but no water enters and the supply is confirmed good, replace the dishwasher water inlet valve.
- If the dishwasher float is damaged, jammed, or no longer moves and resets properly, replace the dishwasher float assembly.
- If the dishwasher only starts or fills when you push hard on the door, replace the dishwasher door latch.
- After the repair, run a short cycle and confirm the tub takes in water within the first minute or two.
- If none of those clues fit cleanly, book service instead of moving on to control-board guessing.
Repair guide: How to Replace a Dishwasher Water Inlet Valve
Related repair guide: How to Replace a Dishwasher Float Assembly
A good result: If water enters normally and you hear wash action instead of dry humming, the next step was correct.
If not: If the dishwasher still stays dry after the supported repair, the problem is beyond the common homeowner-confirmable causes and needs deeper electrical diagnosis.
What to conclude: A clean, clue-based repair beats replacing expensive parts on a maybe.
Replacement Parts
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FAQ
Why is my dishwasher making a humming noise but not filling with water?
Most often, it is trying to fill but cannot. The usual reasons are a closed or restricted water supply, a stuck dishwasher float, or a dishwasher water inlet valve that is humming but not opening.
Is it normal for a dishwasher to make noise before water comes in?
Yes. Many dishwashers run a short drain at the beginning of the cycle. That is normal. The problem is when that startup sound happens and the tub still stays dry after a minute or two.
Can a bad dishwasher door latch cause no water to enter?
Yes. If the latch is not proving the door closed, some dishwashers will not move into a normal fill. A good clue is a machine that only starts or fills when you push hard on the door.
How do I know if the dishwasher float is stuck?
Open the tub and gently lift and lower the float. It should move freely and drop back down. If it stays up, feels gritty, or is blocked by debris, the dishwasher may think it is already full and refuse to fill.
Should I replace the dishwasher water inlet valve first?
Not first. Check the shutoff valve, supply line, float, and door latch clues before buying parts. Replace the dishwasher water inlet valve when the supply is confirmed good and you hear the valve area hum with no water entering.
Can low house water pressure cause this?
It can, but a fully dry tub with a clear humming no-fill pattern is more often a shutoff, restriction, stuck float, or failing inlet valve. If other fixtures at the sink also have weak hot water flow, check the house-side issue too.