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The door seal on a dishwasher is what keeps hot water inside a cabinet full of kitchen units, so a failed one shows up as a leak at the front or as steam escaping where it should not. On a B-Flasche dishwasher the order below is what makes this page worth reading — the causes are ranked for this kind of machine, not listed alphabetically.
What owners actually report
- Water running down the front of the door — A seal that is not compressing, or is being held open by debris.
- Steam escaping at the top or the sides during the cycle — The early stage. Steam finds a gap long before liquid water does.
- The seal is hard, cracked or standing out of its groove — Visible on inspection and conclusive.
- The door needs a firm shove to latch — A swollen or displaced seal fights the latch, which also wears the latch.
- NEAR MISS — water underneath but the door face is dry — That is a hose or pump leak travelling along the base, not a seal problem.
Causes in order of likelihood
- Grease and debris on the seal face — First, and the most fixable: the seal sits where every dirty plate passes, and a film of grease with a seed or a label in it holds the seal open a fraction at exactly one point.
- Seal hardened with age and heat — Second. Repeated hot cycles drive the plasticiser out of the rubber, so it takes a set and no longer springs back against the door.
- Seal displaced from its groove — Third, usually after cleaning or after something has been dragged past it. A displaced section leaks constantly and is easy to see.
- Door alignment or hinge wear — Fourth. A door that has dropped compresses the seal unevenly, and no amount of new rubber fixes a door that does not close square.
The diagnostic order
- Run a finger round the whole seal — Greasy, hard or displaced sections are found by touch faster than by eye.
- Watch the door edges during a hot cycle — Steam marks the leak point precisely, and it does it before water does.
- Close the door and look at the gap down each side — An uneven gap is an alignment verdict, and it changes the repair entirely.
What an owner can safely check
- Clean the seal and the tub lip it meets — Warm soapy water and a cloth all the way round, including the underside of the lip where grease collects.
Tools: clothAbout 20 min
- Press any displaced section back into its groove — Work from the middle of the displaced run outwards so you are not left with a bulge at one end.
About 15 min
- Check the seal for hardness — It should compress under a thumb and spring back. A seal that stays dented is finished.
About 10 min
- Tighten the door hinge and handle fixings — Loose fixings let the door move; tightening them restores even compression across the seal.
Tools: screwdriverAbout 20 min
- STOP before replacing the seal on a built-in machine — The machine usually has to come out of the cabinet to fit the lower seal correctly.
The safety boundary on this repair
Safety
Water and mains voltage share a small cabinet in this machine, so the breaker goes off before a panel comes off and stays off while your hands are inside. Shut the supply tap as well before undoing any hose. Leave the door interlock alone — it is what stops the drum turning or the heater firing with the door open.
When this stops being a home job
Cleaning the seal and the lip it meets is genuinely worth doing first, because grease and debris cause more of these leaks than perished rubber does. Beyond that, a built-in machine has to come out to be worked on safely, with the water isolated and the supply off. When you book, say whether you are seeing steam or water — steam is the early warning and a cheaper visit.
The rest of this family
What is deliberately left out
Treat this as the generalized B-Flasche dishwasher page. It is written to be true across the platform, which means it stops short of the details that only hold for one family — connector pinouts, specific board revisions, the order the cabinet comes apart in. Those live on the family- and model-level pages linked here, and where one exists for your unit, that page outranks this one.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
