Central Minnesota Appliance RepairCMN Appliance
SYMPTOM · LEAKING

Dishwasher Leaking Diagnosed by Where the Water Shows

A leaking dishwasher is almost always a door seal, a fill / drain hose, a cracked sump, or a stuck float — not a failed pump motor. The first diagnostic is location: floor in front of the door is a different fault from water pooling under the cabinet behind the kick plate. Below: the eight causes we actually find, in the order we find them, across every major brand.

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Reviewed by Mike Larson, Master Appliance Technician · 18+ yrs in-field · Last reviewed

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Quick answer

Dishwasher Leaking

Locate the leak first: (1) front of the door at the floor → door gasket or door latch alignment; (2) under the cabinet kick plate → drain hose, inlet valve, or sump crack; (3) inside the tub overflowing the door → stuck float switch or overfill from a failed water-inlet valve. Most repairs land $225–$485 all-in. Flat $149 trip fee waived on approval. 1-year written warranty.

Root causes, ranked by what we find

Most-likely failures (by frequency)

1. Failed or hardened door gasket (most common, front-of-door leaks)

What it is: The rubber tub gasket runs around three sides of the tub and along the bottom of the door. Hard water, detergent residue, and age harden it; the door no longer seals at the bottom corners. Symptom: a puddle dead-center in front of the dishwasher mid-cycle. Bosch, KitchenAid, Whirlpool, Samsung, LG, GE, Maytag all affected.

Fix: Replace OEM tub gasket and door seal, clean the sealing surface, verify door latch closes square. 30–45 minutes.

Typical all-in: $185–$265 all-in

2. Drain hose split or loose at the disposal / air gap

What it is: The corrugated drain hose rubs against the cabinet floor or the disposal clamp loosens. Symptom: water under the cabinet but the tub gasket is dry. Often the hose appears intact until you flex it.

Fix: Replace OEM drain hose, re-clamp at both ends with stainless worm clamps, re-secure the high loop.

Typical all-in: $195–$285 all-in

3. Water-inlet valve leaking (under cabinet, behind kick plate)

What it is: The brass / plastic inlet valve weeps from the solenoid body or the supply-line fitting. Hard water mineral buildup cracks the diaphragm. Symptom: slow dripping under the front-left of the cabinet, sometimes only during fill.

Fix: Replace OEM inlet valve, replace the supply-line washer, verify shutoff valve under the sink for upstream leaks.

Typical all-in: $215–$315 all-in

4. Stuck float switch — dishwasher overfills and spills out the door

What it is: The float in the tub corner tells the inlet valve to stop filling. Debris jams the float in the down position. Symptom: water pours from the front of the door mid-cycle, tub is overfilled.

Fix: Clean the float and float chamber, replace float switch if shorted. Verify shutoff after 2 quarts in service mode.

Typical all-in: $185–$265 all-in

5. Cracked sump or tub-to-sump gasket

What it is: Years of hot/cold cycling crack the plastic sump weldment or harden the sump gasket. Symptom: leak only under the cabinet, only during wash phase, dry overnight. Common on older Whirlpool / KitchenAid / Maytag direct-drive platforms.

Fix: Pull dishwasher, replace OEM sump gasket; replace sump assembly if cracked. 60–90 minutes.

Typical all-in: $285–$425 all-in

6. Door latch out of alignment (Bosch / KitchenAid / Samsung)

What it is: Even with a good gasket, a misaligned latch lets the door lift at the top mid-cycle. Symptom: leak high on the door, sometimes only during heavy wash. Frequently after a dishwasher is moved or a door panel is replaced.

Fix: Re-square the latch strike, shim the door hinges if dropped, verify door compresses gasket evenly top-to-bottom.

Typical all-in: $165–$225 all-in

7. Wash-arm bearing leak (rare — drips onto the sump)

What it is: The lower wash-arm bearing on Bosch / Miele tall-tub platforms cracks and water bypasses the sump seal. Symptom: water under the cabinet only, no error code, gasket dry. Hard to diagnose without pulling the lower arm.

Fix: Replace OEM lower wash-arm hub and bearing kit. Verify under load.

Typical all-in: $245–$345 all-in

8. Cracked tub (last suspect — recommend replacement)

What it is: Plastic-tub units (entry-level Whirlpool, Frigidaire) crack at the heating-element pass-through after years of thermal cycling. Stainless-tub units almost never crack. Symptom: persistent leak from a specific spot on the tub bottom, water continues even with valves off.

Fix: Tub replacement is rarely economical — we quote against a new dishwasher and apply the trip fee toward the recommendation.

Typical all-in: Quote against replacement

Symptom → cause

What's the pattern telling you?

If you see thisIt's almost certainlyRead more
Water at the front-bottom of the toe-kick mid-cycleDoor gasket failure or door seal misalignmentDoor-seal repair
Water beneath unit, no visible front leakDrain hose, sump, or pump-housing crackSump / pump repair
Bosch shows E15 error (water in base pan)Float switch tripped by leak in base — diagnose sourceBosch E15 fix
Samsung shows LC / LE leakage errorDrain hose disconnection or check-valve back-leakSamsung LC/LE
Suds pouring out — used dish soap by mistakeOverfoaming — run rinse cycles with vegetable oil to break sudsDetergent advice
Water from rear at install-time onlyLoose inlet-valve compression fittingInstall repair
Spray-arm spraying out the door ventsCracked spray arm or improper rack loading hitting doorSpray-arm issues
Heater element seal weeping at bottomHeater element gasket — common on older Whirlpool / KenmoreHeater seal repair

By brand

How leaks fail on each brand

BrandTop failure modeSignature symptomBrand page
BoschE15 base-pan leak detectionFloat switch trips, won't drain, error on display.Bosch E15 →
SamsungDrain hose / check valve (LC / LE)Leakage error after a fill cycle.Samsung LC/LE →
KitchenAid / WhirlpoolDoor gasket + sump-seal weepWater along front toe-kick mid-wash.KitchenAid →
LGInlet-valve flood + AE errorAE on display, slow drip from rear when off.LG AE →
GESpray-arm seal + tub corrosion on older unitsDrip from inside-tub-side gasket.GE leaks →
MieleAquastop inlet valve + drain-hose clipWater-stop light, no fill, drip from rear.Miele repair →

Diagnostic order

How to find a dishwasher leak in 5 minutes

  1. 1. Dry everything, then run a Rinse cycle

    Wipe under and around the dishwasher dry. Start a Rinse-only cycle so you watch the leak develop from a clean baseline.

  2. 2. Front of the door at the floor → gasket or latch

    If water shows at the front of the door within 2 minutes of fill, the tub gasket has failed or the latch isn't compressing the door square.

  3. 3. Under the kick plate → hose, valve, or sump

    Pull the kick plate. Watch with a flashlight during fill (inlet valve), wash (sump / hose), and drain (drain hose). The phase tells you the part.

  4. 4. Overfilling out the door → stuck float

    If the tub fills past the heating element and pours out the door, the float is stuck down. Clean the float chamber and test.

  5. 5. Persistent slow drip with power off → supply line

    If water still shows with the dishwasher off and the disconnect tripped, the leak is the supply-line fitting at the inlet valve, not the dishwasher itself.

FAQs

Common questions

Why is my dishwasher leaking from the front?

Front-of-door leaks are almost always the tub gasket (hardened with age and detergent buildup) or a misaligned latch that lets the door lift at the top mid-cycle. Both are fixed at $165–$265 all-in with OEM parts on the truck.

Why is water under my dishwasher but the tub gasket looks fine?

The leak is upstream or downstream of the tub: water-inlet valve (drips during fill), drain hose (drips during drain), or a cracked sump / wash-arm bearing (drips during wash). Pull the kick plate and watch with a flashlight — the cycle phase that produces the leak tells you the part.

How much does it cost to fix a leaking dishwasher in Minneapolis?

Most leak repairs land $165–$425 all-in. Gasket $185–$265, latch $165–$225, drain hose $195–$285, inlet valve $215–$315, sump $285–$425. The $149 trip fee is credited toward any approved repair. Same-day windows weekdays before 2 pm.

Is a leaking dishwasher dangerous?

Yes — a slow leak under the cabinet rots subfloor and grows mold long before you see warped flooring. Don't run another cycle until you identify the source. A $185 gasket job today saves a $2,000 floor repair next year.

Can I run a dishwasher with a leak?

No. If the leak is anywhere upstream of the door (inlet valve, sump, hose, wash-arm bearing), each cycle dumps gallons. If it's a slow door-gasket weep, you have a little more time, but the rot risk is the same. Shut off the dishwasher supply valve under the sink.

Do you stock the parts to fix a leaking dishwasher same-day?

Yes — we carry OEM tub gaskets, door seals, inlet valves, drain hoses, and float switches for Bosch, KitchenAid, Whirlpool, Samsung, LG, GE, and Maytag on every truck. Sump and wash-arm bearings are ordered next-day when needed.

Twin Cities · field notes

Twin Cities field notes

Bosch E15 leak-pan trip is the most-misdiagnosed Twin Cities dishwasher call — owners think the unit is broken when the actual leak is the inlet hose or sump weep, and the pan-float just did its safety job. We trace the source, replace the failed component, and reset E15. Door-gasket failures on Whirlpool / KitchenAid clusters past year 7 across the metro. Hard well water in Hudson, River Falls, Hastings, Lake Elmo accelerates inlet-valve diaphragm failure by ~30%.

Related coverage

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Pricing & repair-cost pages

Trying to decide repair vs. replace? These pages break down real all-in pricing by brand, model class, and failure mode — so you know the number before we knock.