In this article
First things first, stop the water. Turn the dishwasher off and kill the power at the plug or the breaker. Then find the little valve that feeds it. It's usually at the very back of the sink cabinet, hiding behind the cleaning bottles. Close it. A slow drip can soak the subfloor for weeks before a stain ever shows up in the ceiling below.
Now look at where the water is. Where it collects tells you a lot more than how much there is.
What a dishwasher leak is telling you
If water only shows up while the dishwasher is running, it's escaping from the tub or from something that moves water during the cycle. If it drips with the machine switched off, it's on the supply side. That line stays pressurized day and night.
When the leak happens matters just as much. Leaks during the fill and leaks during the drain have different suspects. Take the kick plate off, grab a flashlight and sit on the floor through a short cycle. It's boring, and it's the fastest way to find it.
Where the water appears
A puddle along the front, under the door, usually means water is sneaking past the door seal. A gasket that's gone flat with age is a common cause. So is one that's torn, or that's twisted out of its groove after someone dragged a rack across it. A dishwasher that leans forward a little can also push water toward the door.
Wet floor at one side, close to the cabinet? The fill line and the drain hose both run along there behind the kick plate.
Water under the machine that only appears while it drains is usually the pump or one of the hose clamps near it. Pump seals wear out with years of hot water. Clamps loosen and let a hose creep off its fitting.
Drips with everything switched off almost always come back to the water inlet valve or the nut on the supply line. A valve that sticks partly open lets a trickle through. A cracked supply line just weeps.
Leaking from the bottom
A dishwasher leaking from the bottom is the hard one to spot, since the base sits right on the floor behind the kick plate. Pop the plate off, it's held by a couple of screws, and shine your light under there while the machine fills and drains.
Some dishwashers have a shallow tray in the base with a float in it. When water collects in the tray, the float shuts the machine down. On a Bosch that shows up as the E15 code. You can dry the tray and the code goes away, but the water came from somewhere and it'll come back. Our Bosch page has more on that code.
Too much detergent and the wrong loading
Hand dish soap is the classic mistake when the dishwasher detergent runs out. A small squirt turns into a tub of foam, and the foam squeezes out around the door. If that's what happened, run a rinse cycle or two with nothing in the cup until the suds are gone.
Too much real dishwasher detergent can do a smaller version of the same thing, more so in soft water. Big sheet pans can cause trouble too. Stand one right against the door and it throws spray straight at the seal, and water sneaks out at the top corners.
Connections under the sink
Open the sink cabinet and start at the shutoff valve. Follow the supply line from there toward the dishwasher. Then trace the drain hose up to where it connects to the disposal or the drain pipe. Dry every joint with a paper towel and start the dishwasher. A few minutes in, check them again. The joint that's wet is your leak.
A supply nut that's just a little loose can be snugged up by hand. A fitting that's cracked or green with corrosion needs replacing, not more muscle, and stripped threads won't hold no matter how hard you turn.
What you can check safely
- Power and water off before you touch anything.
- Run a finger around the door gasket for tears and loose spots.
- Lay a level across the front edge and check it side to side.
- Watch the fittings under the sink while it runs.
- Kick plate off and a flashlight underneath.
Past that, leave it to us. The pump and the valves sit right next to the wiring under the tub, and getting at them means sliding the machine partly out of the cabinet.
When a dishwasher leak needs a repair
Call when you can't find where the water comes from, or when it's coming from under the tub. A part that's cracked rather than just loose is another reason. Pump seals and inlet valves are routine repairs, and door gaskets more routine still. A tub that's cracked or rusted through is the one case where a new dishwasher often makes more sense, and the technician will tell you that before you pay for anything.
We fix dishwasher leaks around Parma and Cleveland. You get the price up front, and the fix is covered for three months. Call (216) 352-3935 or read about a visit on our dishwasher service page. If the leak comes with dishes that aren't getting clean, this guide may help too.
Questions people ask
Why is my dishwasher leaking from the bottom?
Usually a worn pump seal or a loose hose clamp under the tub. Remove the kick plate and watch with a flashlight during the fill and the drain. Water that appears during the drain points to the pump area.
Why is water coming out of the dishwasher door?
A damaged or twisted door gasket is the usual cause. Too many suds and a dishwasher that tilts forward do the same. Check the gasket first, then make sure the machine sits level.
Can I use dish soap in the dishwasher if I run out of detergent?
No. Hand dish soap makes far too much foam, and the foam pushes out through the door. Run a few rinse cycles without detergent to clear it.
Why does my dishwasher leak when it is turned off?
Water under pressure can only come from the supply side. A water inlet valve stuck partly open or a cracked supply line is the likely cause. Close the valve under the sink and call for a repair.
Is it safe to keep using a leaking dishwasher?
It is better not to. Even a small leak can damage the floor and cabinet under it. Turn off the water to the dishwasher until the cause is found.
Is a leaking dishwasher worth repairing?
Most of the time, yes. Gaskets and clamps are inexpensive, and valves and pump seals are reasonable repairs too. A cracked or rusted tub is the main exception.
