Humming right after pressing Start
You close the door, hear a hum or low motor sound within the first minute, but no splash or fill sound follows.
Start here: Check the water supply valve and the dishwasher float first.
Dishwasher troubleshooting
Dishwasher Making Noise but No Water
Direct answer: If a dishwasher makes noise but no water enters, the usual causes are a closed or restricted water supply, a stuck dishwasher float, a door that is not fully latching, or a failed dishwasher water inlet valve. Start with the supply and float before touching parts.
Most likely: Most of the time this is a fill problem, not a wash pump problem. A hum right after you start the cycle with a dry tub points to water not getting in.
First pin down when the sound happens. If you hear a hum or click in the first minute and the tub stays dry, stay on the fill side: water supply, float, latch, then inlet valve. If there is standing water from the last cycle or a grinding sound from below, you are likely on a different problem and should change course.
Don’t start with: Do not start by replacing the dishwasher pump just because you hear a motor sound. A dry dishwasher can still hum, click, or run briefly with no fill.
Quick splitDry tub right after start usually means no fill, not a drain problem.
Worth knowingA light click is normal. A steady hum with no water sound is not.
Last reviewed: 2026-04-01
What this usually looks and sounds like
Clicking or brief buzzing, then nothing
The dishwasher acts like it is trying to begin, may click once or twice, then sits quiet with a dry tub.
Start here: Make sure the door is fully latching and the cycle is actually starting.
Cycle seems to run but dishes stay dry
The timer or display advances, but there is little or no water inside and detergent may stay mostly undissolved.
Start here: Look for a stuck float or a fill valve that is not opening.
Noise with standing water already in the tub
You hear noise, but there is old water pooled in the bottom from the previous cycle.
Start here: Do not chase the fill side first. Move to a drain-related problem instead.
Most likely causes
1. Water supply to the dishwasher is shut off or restricted
The machine can power up and make normal startup sounds even when no water is available to fill the tub.
Quick check: Confirm the shutoff valve under the sink is fully open and the dishwasher supply line is not kinked.
2. Dishwasher float is stuck in the up position
A stuck float tells the dishwasher it is already full, so it will block filling even though the tub is dry.
Quick check: Find the float inside the tub and make sure it moves up and down freely without grit or debris under it.
3. Door is not fully latched or latch switch is not proving closed
Some dishwashers will light up and make brief startup sounds, but they will not open the fill valve unless the door is fully latched.
Quick check: Press the door firmly closed and restart the cycle. If it only works when you hold pressure on the door, the latch is suspect.
4. Dishwasher water inlet valve has failed or is clogged at its screen
If supply is on, the float moves freely, and the door is latching, the fill valve becomes the main suspect.
Quick check: Listen near the lower front area during the first fill attempt. A steady hum with no water entering often points to the valve or a blocked valve screen.
Step-by-step fix
Step 1: Make sure you are actually on a no-fill problem
A dishwasher with old standing water or a hard grinding noise is usually not the same problem. Sorting that out first saves time.
- Open the dishwasher after canceling the cycle and look at the bottom of the tub.
- If the tub is dry or nearly dry, restart a normal cycle and listen during the first minute.
- Listen for a water rush or splashing sound versus only a hum, click, or buzz.
- If you already have standing water from the last cycle, stop here and treat it as a drain problem instead.
Next move: If you hear water entering and the tub begins to fill, the issue may be intermittent or related to the door not being fully closed every time. If the tub stays dry and you only hear startup noise, keep going on the fill checks.
What to conclude: You are confirming whether the dishwasher is failing to fill, or whether a different problem is making similar noise.
Stop if:
- There is standing water high in the tub and it starts to rise further.
- You hear sharp grinding, metal-on-metal noise, or smell something hot.
- Water begins leaking under the dishwasher or from the supply connection.
Step 2: Check the dishwasher water supply under the sink
A partly closed shutoff or kinked supply line is common, safe to check, and easier than pulling the dishwasher apart.
- Look under the sink for the small shutoff valve feeding the dishwasher supply line.
- Make sure the valve is fully open, not halfway closed.
- Inspect the visible supply line for a kink, crush point, or sharp bend.
- If you recently had sink or cabinet work done, make sure the line was not bumped or pinched.
- Run the dishwasher again and listen for the fill sound.
Next move: If water enters normally now, the problem was the supply being shut off or restricted. If the supply is clearly on and the tub still stays dry, move to the float and door checks.
What to conclude: You have ruled out the simplest outside cause before blaming internal dishwasher parts.
Step 3: Check the dishwasher float and the door latch behavior
A stuck float or weak latch can stop filling even though the dishwasher powers up and sounds like it is trying to start.
- Inside the tub, locate the dishwasher float, usually a small dome or cap near the front corner.
- Lift it gently and let it drop. It should move freely and settle back down without sticking.
- Clean away food grit or scale around the float with warm water and mild soap on a soft cloth.
- Close the door firmly and restart the cycle.
- If safe to do, press lightly on the door during startup. If it suddenly begins filling, the latch is not proving closed reliably.
Next move: If freeing the float or firmly closing the door restores filling, you found the fault area. If the float moves freely and door pressure changes nothing, the fill valve becomes more likely.
Step 4: Listen for the fill valve and decide whether the valve is the likely failure
Once supply, float, and latch checks are done, the dishwasher water inlet valve is the main no-fill suspect.
- Start a cycle and listen near the lower front kick area during the first fill attempt.
- A steady hum for several seconds with no water entering points toward the dishwasher water inlet valve or its inlet screen.
- If there is no hum at all and the machine just sits, recheck the door latch behavior and controls before buying anything.
- If you are comfortable shutting off power and water, remove the lower access panel and inspect for obvious leaks, corrosion, or a pinched internal fill line.
- Do not poke into live wiring or force the valve screen with sharp tools.
Next move: If you find clear corrosion, a blocked screen, or obvious valve trouble, you have a supported part direction. If nothing is obvious and the machine still will not fill, the next step is a controlled repair or a service call rather than guesswork.
Step 5: Replace the confirmed fault or change course cleanly
Once the symptom is narrowed down, the fix is usually straightforward. The key is not buying the wrong part for the wrong sound.
- If the float is physically damaged or still sticks after cleaning, replace the dishwasher float assembly.
- If the door only starts filling when pushed or the latch is visibly worn, replace the dishwasher door latch.
- If supply is on, the float moves freely, the door latches properly, and you hear the valve hum with no fill, replace the dishwasher water inlet valve.
- If you actually have standing water or the sound is a harsh grind from below, stop and move to a drain or grinding-noise problem instead of replacing fill parts.
- After the repair, run a short cycle and confirm you hear water enter within the first minute and see water in the tub.
A good result: If the dishwasher fills normally and begins washing, the diagnosis was on target.
If not: If the dishwasher still stays dry after the supported repair, stop replacing parts blindly and have the unit professionally diagnosed.
What to conclude: You have either fixed the no-fill fault or reached the point where electrical diagnosis is needed.
Replacement Parts
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
FAQ
Why is my dishwasher humming but not filling with water?
The most common reasons are a closed water supply valve, a stuck dishwasher float, a door latch that is not proving closed, or a bad dishwasher water inlet valve. If the tub stays dry during the first minute, stay on those checks first.
Can a dishwasher make noise even if no water is coming in?
Yes. The control, latch, and some motors can make clicks, hums, or brief startup sounds even with a dry tub. That is why the sound alone does not mean the pump is bad.
How do I know if the dishwasher float is stuck?
Open the tub and find the float near the front area. It should lift and drop freely. If it stays up, feels gritty, or does not settle back down, it can block filling.
Should I replace the dishwasher pump if it sounds like it is running dry?
Usually no, not on this symptom. If the dishwasher is dry from the start, check the water supply, float, latch, and inlet valve before blaming the pump. Blind pump replacement is a common wasted move here.
What if my dishwasher has standing water and also makes noise?
That usually points away from a simple no-fill problem. If there is old water in the tub, switch to a drain-focused diagnosis instead of replacing fill parts.
Can a bad door latch stop a dishwasher from filling?
Yes. Many dishwashers will not open the fill valve unless the door is fully latched. If the machine starts filling only when you press on the door, the latch is a strong suspect.