At a glance
Symptoms
- • Puddle on the floor in front of the dishwasher mid-cycle or right after
- • Water dripping from the bottom of the door
- • Wet kick-plate at the base of the dishwasher
- • Slow water damage on the floor or cabinet sides next to the unit
- • Water suddenly appearing only during fill or drain (timing is a major diagnostic clue)
Common causes
- • Door gasket worn, dirty, or pinched — most common
- • Door not closing flush due to bent hinge, warped tub, or out-of-level install
- • Water inlet valve dripping (slow drip during fill or even when off)
- • Drain hose connection loose at the disposal or air gap
- • Tub float assembly stuck high, causing overfill and door splash
- • Internal hose split (pump-to-tub or recirculation hose) — leaks during wash phase only
- • Cracked or pinhole-leaking sump or tub bottom — usually fatal for the unit
- • Faulty pump shaft seal weeping water at the motor base
Safety First — Read Before You Start
- •Shut off the breaker before removing any panels — water and electricity at the floor level is a serious shock and short-circuit risk.
- •Shut off the water supply valve under the sink before disconnecting hoses or replacing the inlet valve.
- •If the leak has reached the floor pan or the surrounding cabinet, dry the area thoroughly before running another cycle — a wet motor will short.
- •Do not run the dishwasher with the kick-plate off and live wiring exposed.
- •If you see scorch marks or smell burnt insulation around the bottom motor, stop — the unit has shorted and needs professional diagnosis.
Tools & supplies you'll need
- Phillips and flat-head screwdrivers
- Channel-lock pliers or 1/4-inch nut driver
- Flashlight
- Paper towels and a baking sheet (slide under the unit to localize the drip)
- Multimeter (for testing the inlet valve)
- Replacement door gasket (have it on hand if yours looks compressed)
- Level (4-foot bubble level)
Step-by-step instructions
Localize the leak with a baking sheet test
Slide a clean baking sheet (or a flat aluminum tray) under the front of the dishwasher just past the kick-plate. Run a normal cycle and watch the tray. Front-to-back position of the puddle tells you a lot: front edge = door or gasket; left side = water inlet valve; right side or back = drain hose or pump. Also note timing: a leak only during fill points to the inlet valve or float overfill; only during wash points to the recirculation hose or door splash; only during drain points to the drain hose or pump seal. This 5-minute test saves an hour of disassembly.
Tip: Mark the puddle perimeter with painter's tape on the dry floor before the next cycle so you can see whether the leak is growing or stable.
Inspect and clean the door gasket
Open the door and run your finger around the entire perimeter gasket — both the U-shaped tub gasket and the lower door bottom seal. Look for cracks, hardened sections, food debris, or deformations from a forgotten utensil. Wipe the gasket with hot soapy water and a soft cloth. Close the door on a dollar bill at the top, sides, and bottom — if the bill pulls out with no resistance, the gasket has lost compression. Replacement gasket runs $25-45 and pulls out / pushes in by hand on most modern units (Bosch, KitchenAid, Whirlpool, Samsung).
Tip: A gasket that looks fine but has a fold from being stuffed in wrong during a previous repair will leak at exactly that fold. Pull the entire gasket out, wipe the channel clean, and reseat slowly.
Verify the door alignment and that it closes flush
With the door slightly ajar, look at the gap between the door and the tub all the way around. The gap should be even — if one side is wider than the other, a door hinge is bent or a spring is stretched. Most modern dishwashers have door-balance springs at the bottom (under the kick-plate) that should be even tension. A loose tub mounting (those two screws under the countertop) can also cause the entire unit to lean forward when the door opens, breaking the seal. Tighten countertop mounting screws and re-test. Also confirm the dishwasher is level using a 4-foot level on the door — out-of-level units leak from the corner that hangs lower.
⚠Warning: Do not over-tighten the countertop mounting screws — you will crack the laminate or split the cabinet face.
Check the water inlet valve for drips
Remove the bottom kick-plate. The inlet valve is on the front-left or front-right corner, where the supply line enters. Look at the valve body and the rubber boot above it (which connects the valve to the tub) for any drip marks or mineral staining. Run a cycle and watch the valve directly during the fill phase — water should flow only when the solenoid clicks open. A constantly dripping valve (even when not filling) means the diaphragm has failed; a leak from the boot above means the rubber connector is split. Replacement valve: $35-60. Replacement boot: $20-35.
Tip: A water inlet valve that fails partially open will keep the unit filling — eventually the float trips and water sloshes out the door. If your dishwasher seems to overflow rather than just leak, suspect the inlet valve before the float.
Test the float and overfill protection
The float is a small cup-shaped plastic piece in the front-center of the tub bottom (Whirlpool, KitchenAid, GE) or absent on some Bosch/European models that use a flow meter instead. Lift the float with your finger — it should slide up and down freely. If it sticks high, debris under the float is jamming it open and the unit will overfill. Pull the float cap off, clean underneath, reinstall. Also test the float switch underneath (with power off) for continuity — should change state when the float lifts. A failed switch lets the inlet valve continue filling past the safe level.
Tip: Mineral scale around the float seat is the #1 cause of overfill leaks in hard-water Southern California homes. Wipe it with vinegar.
Inspect drain and recirculation hose connections
Pull the dishwasher out enough to see all hose connections. Check the drain hose connection at the disposal/air gap — clamps loosen over time, and a slight drip during drain phase means the clamp needs a 1/4 turn tighter. Inside the unit (kick-plate off), follow the recirculation hose from the wash pump up to the spray arm manifold. Any cracking, swelling, or moisture along that hose is your leak. Replacement hoses: $20-50. While you are in there, also feel the bottom of the wash pump motor — if it is wet, the shaft seal has failed and the entire pump assembly needs replacement ($180-300).
⚠Warning: A leaking pump shaft seal usually means water has been getting onto the motor windings for some time. Check for any sign of corrosion or rust on the motor — if present, replace the pump rather than just the seal.
Check for cracked sump or tub damage
If you have eliminated all of the above and water still appears under the unit, the bottom plastic sump or stainless tub itself may have a crack. With the unit pulled out, fill the tub with about an inch of water using a pitcher (do not run a cycle), wait 15 minutes, and look underneath for any wet spots. A pinhole leak in the sump is repairable with food-grade epoxy as a temporary fix; a cracked tub or sump generally means the dishwasher is at end-of-life. Most plastic sumps that crack do so along a stress seam from years of thermal cycling.
Brand-specific notes
Some brands have known design quirks worth knowing about before you start.
Bosch
Bosch SHE/SHX/SHP series do not use a traditional float — they rely on a flow meter and a leak-detection pan in the bottom of the unit. If the pan ever sees water, the unit shuts down and throws E15 (also written "E:15"). That is a feature, not a failure: the unit detected a leak and protected itself. Pull the unit out, dry the pan thoroughly (at least 24 hours), find and fix the actual leak, then reset by tipping the unit forward 45 degrees to drain the pan.
KitchenAid
KitchenAid KDTM, KDTE, and KDPE series have a known issue with the lower door gasket compressing flat by year 4-6, especially on heavy-use households. Symptom: water on the floor only during the heavy wash cycle. Replacement is a $35 part and pulls out by hand — no special tools. Also check the upper-rack water-supply gasket where the rack docks; it leaks into the tub but can splash out the door if loaded heavy.
Whirlpool
Whirlpool WDT and WDF series often leak at the spray-arm bearing — water travels down the arm shaft into the wash pump area, then out the bottom. If you see a wet spot center-bottom but the gasket and hoses are dry, pull the lower spray arm and check the bearing collar. Also: the water inlet valve on these models is the same part across many years and is a 10-minute swap if it fails.
Samsung
Samsung DW80 and DW60 series have an integrated leak sensor that triggers a "LE" or "LC" error code. Like Bosch, the unit shuts down. The most common false trigger is residual water from a previous overfill that never dried — verify the sensor area is dry before assuming a real leak. Real leaks on these models are most often at the pump-to-tub elbow gasket.
What our techs see most often
Most leak calls we get in LA are not from a dramatic burst — they are from a slow drip at the door gasket that someone wiped up for six months before calling. By then the cabinet kick-plate is rotted and the floor pan rusted. We tell every leak caller to slide a baking sheet under the unit and run a quick rinse cycle before we come out — about a third of the time it is a $30 gasket they can swap themselves. The other big one in California is the float jamming open from hard-water scale; takes 5 minutes to clean but most homeowners have never even seen that part.
When to call a professional
- → You have inspected the gasket, hoses, and inlet valve and the leak source is still not identified
- → Water is leaking from inside the door panel itself rather than around the perimeter (door inner liner cracked)
- → The leak only appears during one specific cycle phase that points to the wash pump or recirculation system
- → Bosch E15 keeps re-triggering after you have dried the pan and replaced the obvious failed component
- → Floor or cabinet damage requires water mitigation before further work is safe
- → Smell of burnt electrical insulation or visible scorching on the pump or wiring
- → You are on the second gasket replacement and it still leaks — the door or tub is warped
Dishwasher Maintenance & Replacement Tasks
Step-by-step guides for individual maintenance jobs related to this appliance.
How to Clean a Dishwasher Filter (All Brands)
How to Clean Dishwasher Spray Arms (Unclog the Jets)
How to Descale a Dishwasher with Vinegar or Citric Acid
How to Replace a Dishwasher Door Gasket
Frequently asked questions
Why does my dishwasher leak only during certain cycles?
Cycle timing is a strong diagnostic clue. Leak only during fill = water inlet valve or supply line. Leak during wash phase only = door gasket, recirculation hose, or float overfill. Leak during drain phase only = drain hose connection or pump seal. Continuous slow drip = inlet valve diaphragm or supply line connection.
Can I keep using my dishwasher with a small leak?
No. Even a small leak rots the kick-plate, warps subfloor, and can short out the wash motor or wiring at the bottom of the unit. What looks like a drip can grow into a major water-damage claim very quickly. Stop running the unit until the leak is identified and fixed.
Why is water leaking even when the dishwasher is off?
A leak when the unit is off and idle means a pressurized component upstream of the inlet valve is dripping — almost always the supply line connection or the inlet valve diaphragm itself. Shut off the supply valve under the sink immediately and replace the failing component.
How much does it cost to fix a leaking dishwasher?
Door gasket replacement: $25-45 part, $130-180 with labor. Water inlet valve: $35-60 part, $180-240 installed. Drain hose: $20-50 part, $150-220 installed. Wash pump shaft seal failure (pump replacement): $180-300 part, $400-550 installed. At Axis our $90 diagnostic fee applies toward the repair.
My Bosch is showing error E15 — what does that mean?
E15 means the leak-detection sensor in the bottom pan has detected water. The dishwasher will not run again until the pan is fully dry and the leak source is fixed. Pull the unit out, tip it forward to drain residual water, leave it tipped on a couple of 2x4s overnight, and find/fix the real leak (usually a hose or gasket) before resetting.
Related Repair Guides
Dishwasher Not Draining: How to Fix Standing Water
A pool of dirty water sitting at the bottom of your dishwasher after a cycle is one of the most common service calls we get. The good news: roughly 7 out of 10 cases trace back to a clogged garbage disposal connection or a blocked filter — both of which you can fix in under an hour without any special tools.
Dishwasher Not Cleaning Dishes Properly: Fix Guide
Dishes that come out gritty, filmy, or still flecked with food are usually not a detergent problem — they are a water problem. Hard water mineral deposits, clogged spray arm jets, and a starved water inlet valve cause roughly 80% of these complaints, especially in Southern California where calcium and magnesium levels run high. Most fixes take 30-90 minutes with no special parts.
How to Clean a Dishwasher Filter (All Brands)
A clogged filter is the number one cause of gritty dishes and foul odors. Learn how to locate, remove, and properly scrub your dishwasher's filter assembly to restore peak cleaning performance and protect your drain pump.