The short answer
A Blomberg dishwasher has an anti-flood float in its base tray, so a leak inside the cabinet usually announces itself as a machine that drains continuously and refuses to run rather than as water on the floor. When water does reach the floor, the door gasket and the inlet connection outrank the tub seal by a wide margin. Take the machine out of service until the source is known.
What you are seeing
- Water on the floor in front of the machine after a cycle
- The machine drains continuously and will not start a programme
- A fault indication tied to water in the base tray
- Drips down the inside of the door rather than under the machine
- A damp or swollen cabinet floor next to the machine with no visible pooling
- A near-miss symptom: condensation on the door front after opening a hot machine, which is not a leak
- Body: Where the water appears, and whether the machine still runs, splits the causes: Water on the floor in front of the machine after a cycle. The machine drains continuously and will not start a programme. A fault indication tied to water in the base tray. Drips down the inside of the door rather than under the machine. A damp or swollen cabinet floor next to the machine with no visible pooling. A near-miss symptom: condensation on the door front after opening a hot machine, which is not a leak.
Causes, most likely first
- A dirty, distorted or damaged door gasket — Why: the gasket runs around the tub opening and takes every knock from loading; grit under it holds the door open along one edge and the leak follows that corner.
- The inlet hose connection at the supply valve — Why: this joint is under mains pressure the whole time the machine is connected, so a weeping connection wets the cabinet floor without the machine running at all.
- Overfoaming from the wrong detergent — Why: hand dish soap in the dispenser produces foam that climbs the tub and escapes past a perfectly sound door seal; it is the cause most often mistaken for a failed gasket.
- A leaking drain hose or a loose clamp behind the machine — Why: only wet during the drain step, which is the timing clue that separates it from an inlet leak.
- A cracked sump or a failed pump seal — Why: this is what usually trips the base-tray float, giving a machine that pumps out continuously rather than a puddle.
- A door that has dropped out of alignment — Why: a machine moved during a kitchen job can sit twisted in its opening, and the door no longer meets the gasket evenly along the top.
- Body: Ranked for a machine with a base tray and a float switch: First, A dirty, distorted or damaged door gasket: the gasket runs around the tub opening and takes every knock from loading; grit under it holds the door open along one edge and the leak follows that corner. Second, The inlet hose connection at the supply valve: this joint is under mains pressure the whole time the machine is connected, so a weeping connection wets the cabinet floor without the machine running at all. Third, Overfoaming from the wrong detergent: hand dish soap in the dispenser produces foam that climbs the tub and escapes past a perfectly sound door seal; it is the cause most often mistaken for a failed gasket. Fourth, A leaking drain hose or a loose clamp behind the machine: only wet during the drain step, which is the timing clue that separates it from an inlet leak. Fifth, A cracked sump or a failed pump seal: this is what usually trips the base-tray float, giving a machine that pumps out continuously rather than a puddle. Sixth, A door that has dropped out of alignment: a machine moved during a kitchen job can sit twisted in its opening, and the door no longer meets the gasket evenly along the top.
What to check, in order
- note whether the floor is wet with the machine idle, which points at the inlet side under constant pressure.
- if it is wet only during the drain step, look at the drain hose and its clamp.
- if water runs down the door front, clean and inspect the gasket and check the door closes evenly on both sides.
- if the machine pumps out continuously and refuses to start, the base-tray float has tripped; that is an internal leak and needs a technician.
- Body: Time the leak, because timing identifies it faster than looking does: First, note whether the floor is wet with the machine idle, which points at the inlet side under constant pressure. Second, if it is wet only during the drain step, look at the drain hose and its clamp. Third, if water runs down the door front, clean and inspect the gasket and check the door closes evenly on both sides. Fourth, if the machine pumps out continuously and refuses to start, the base-tray float has tripped; that is an internal leak and needs a technician.
Checks you can do yourself
- Switch off the machine and close the water supply valve under the sink, then dry the cabinet floor completely — Tools: towels — Time estimate: a few minutes
- Lay paper towel along the toe-kick and leave the machine idle for a few hours to test the inlet side — Tools: paper towel — Time estimate: overnight
- Wipe the whole door gasket and the tub lip, running a finger round for grit, splits or flat spots — Tools: cloth — Time estimate: a few minutes
- Check the detergent in use is a dishwasher product, and run one empty rinse to clear any foam — Tools: none — Time estimate: half an hour or so
- Run a short programme with dry paper towel in place and note which step wets it — Tools: paper towel — Time estimate: half an hour or so
- Body: Establish the source before mopping repeatedly: Switch off the machine and close the water supply valve under the sink, then dry the cabinet floor completely (towels; a few minutes). Lay paper towel along the toe-kick and leave the machine idle for a few hours to test the inlet side (paper towel; overnight). Wipe the whole door gasket and the tub lip, running a finger round for grit, splits or flat spots (cloth; a few minutes). Check the detergent in use is a dishwasher product, and run one empty rinse to clear any foam (none; half an hour or so). Run a short programme with dry paper towel in place and note which step wets it (paper towel; half an hour or so).
Safety first
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Water inside a built-in cabinet reaches the machine wiring and the outlet behind it, so isolate power at the breaker before pulling the machine out, and close the supply valve first. Never run a machine you know is leaking to see how bad it is. unplug-before-service
When to stop and call a technician
These belong to a technician: The machine drains continuously and will not run, which means the base-tray float has tripped. Water appears with the machine idle and the door shut, which is the pressurised inlet side. The cabinet floor or the flooring in front of the machine has swollen. The leak repeats after the gasket, the detergent and the drain hose have all been checked. The machine drains continuously and will not run, which means the base-tray float has tripped Water appears with the machine idle and the door shut, which is the pressurised inlet side The cabinet floor or the flooring in front of the machine has swollen The leak repeats after the gasket, the detergent and the drain hose have all been checked
Nearest pages of the same kind
What this page does not cover
This page is generalized across every dishwasher sold under the Blomberg name: it separates neither the freestanding and semi-integrated stainless machines from the fully integrated panel-ready ones and the compact widths from the full-size cabinets, and it names no individual model. Where a family- or model-specific page exists it is linked here and it outranks this one for that machine; at present no page beneath this one narrows to a single family, so treat the ranking above as the brand-level pattern rather than a reading of your serial plate. For the other faults that turn up on this machine, start from Common Blomberg Dishwasher Problems.
Related pages
- Common Blomberg Dishwasher Problems
- Blomberg Dishwasher: Abnormal Noise or Vibration
- Blomberg Dishwasher: Does Not Clean or Dry
- Blomberg Dishwasher: Controls, Display or Error Code
- Blomberg Dishwasher: Cycle Will Not Run or Complete
- Blomberg Dishwasher: Door, Latch or Seal Fault
- Blomberg Dishwasher: Will Not Drain
- Blomberg Dishwasher: Electrical, Fire or Gas Hazard
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
