A dishwasher that runs but never gets water — or that you can hear humming with nothing coming in — has a break somewhere in the fill path, from the supply valve under your sink to the inlet valve on the machine. A couple of causes are quick checks; the rest are affordable repairs. Here's the order we work through it.
The shutoff valve under the sink that feeds the dishwasher can get bumped closed, or the supply line can kink — no water in.
Check it: Look under the sink for the dishwasher's shutoff valve and make sure it's fully open, and that the small supply line isn't kinked.
A float inside the tub tells the dishwasher when it has enough water. If it sticks in the "up" position (from debris), the machine thinks it's already full and won't fill.
Check it: Find the float (a small plastic dome/cup in the bottom of the tub), clear any debris under it, and make sure it moves up and down freely.
The electrically-operated valve that lets water into the dishwasher can clog with mineral scale or fail, so it won't open. This is a very common cause of no-fill.
Check it: If the supply is on and the float moves freely but still no water, the inlet valve is the likely culprit. It's an affordable part; replacement is a technician repair.
A dishwasher won't start its fill cycle unless it senses the door fully latched.
Check it: Press the door firmly until the latch clicks and start the cycle again.
Many dishwashers have a leak sensor in the base pan; if it detects water there (from a past leak), it shuts off the fill to prevent a flood.
Check it: If the machine seems dead or won't fill and there's been a leak, water in the base may have tripped the float — that needs a technician to clear and confirm.
Most no-fill causes are a free check (supply valve, float, door) or an affordable inlet valve — a dishwasher that won't fill is well worth repairing. Replacement only comes up if it's an old machine with several failing systems.
Last week a customer kept their appliance instead of replacing it — they installed the part themselves with the exact one we shipped, after a $50 Quick Check told them precisely what they needed. That's the whole idea: honest answer, right part, no upsell.
In Middle Tennessee or the Baton Rouge area? We'll come to you, same-day. Anywhere else in the U.S.? Send a 10-second video, a real technician tells you exactly what's wrong for $50 (credited toward the repair), and we ship you the exact part. 24/7 — text, call, or upload anytime.
Something in the fill path is blocked or failed. Start with the free checks: make sure the supply shutoff under the sink is fully open, the float in the tub bottom moves freely, and the door is latched. If those are fine, the water inlet valve has likely failed.
The float is a small plastic dome or cup in the bottom of the tub. Lift it and let it drop — it should move up and down freely. Clear any food debris or scale keeping it stuck in the up position, which makes the dishwasher think it's already full.
Yes — the causes are either free (supply valve, float, door latch) or an affordable inlet valve. It's a straightforward, worthwhile repair unless the machine is old with other major problems.