The short answer
On the BlitzHome BH dishwashers specifically, this fault sits one level below the brand-generic answer: the models in this family share a layout, and that layout changes which check comes first. Where the water appears matters enormously here: at the door is one family of causes, under the machine is another, and behind it is a third. Check for the wrong detergent before dismantling anything — hand dish soap in a dishwasher produces a dramatic leak with no fault present.
What you observe on these models
- Water on the floor directly in front of the door — The door seal, the door itself, or suds escaping past a seal that is working.
- A damp cabinet side or a swollen worktop edge — A slow leak that has been running long enough to reach the joinery.
- Drips from the door only at the end of a cycle — Condensation on the door liner rather than a leak, in many cases.
- NEAR MISS — the floor is wet but the sink waste is also backing up — A blocked shared waste line puts water on the floor without the dishwasher leaking at all.
Causes, most likely first on this family
- Overfilling, or a float switch not working — Fifth: a machine that takes on more water than the tub is designed to hold will push it out at the door, and the float switch exists to prevent exactly that.
- Drain hose connection loose or split — Fourth: the connection at the waste is disturbed whenever anything under the sink is worked on, and it only leaks during the drain step.
- Supply connection or inlet valve weeping — Third, and it is the most urgent entry on this page for exactly that reason.
- What moves, and why it moves, on this platform — Two things reorder this list for these models: where the family puts the component, and how much has to come apart to reach it. A cause that is two minutes away on this platform is worth checking before one that is an hour away, even when the second is marginally more likely.
Check in this order, and why
- Establish where the first water appears — Front of the door, under the kickplate, or under the sink. Those three locations have almost no causes in common.
- Watch which part of the cycle produces the water — Fill, wash or drain — each implicates a different connection, and the distinction is free.
- Check the supply fitting with a dry fingertip when the machine is idle — Any dampness there is a pressurised leak and it takes priority over everything else.
- Why this order suits these models — The sequence above is chosen for this family's construction: each step is picked to eliminate as much as possible before anything has to come apart, so the checks that need no panel removed are done first and the ones that do are left until they are the only possibility remaining.
Before you open anything
Safety
Switch the machine off at its isolating switch and close the supply valve before reaching past the tub. A built-in dishwasher carries mains wiring in a wet enclosure, and the two share a very small space behind the kickplate.
When to call a technician
Call once the filter, the spray arms, the seal, the settings and the connections under the sink have all been checked and the fault survives them. Call at once if water is reaching the cabinet base or the floor, because a built-in machine hides its leak until damage is done.
Other faults covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
