The short answer
On the COSDWV family the usual reason a Cosmo dishwasher is leaking water is door gasket not seating, and that is where the order below departs from the brand-generic article one level up: on the manual-filter build it outranks drain hose joint under the sink. The check that confirms which build you have is simple — a removable filter cylinder in the sump means the seal that matters most sits under it, where the pump meets the tub. The gasket, the loading, the detergent and the levelling are owner work; the sump seal and the inlet valve are not.
What you observe on these models
- Foam visible through the door near the end — Chemistry rather than mechanics, and instantly reversible.
- Water that appears with the machine switched off — Only the pressurised supply side can do that.
- Water at the front, under the door — The classic seal or tilt presentation, and both are checkable in minutes.
- A puddle under the sink rather than the machine — The drain joint, which sees water only at the drain step.
- Water under the centre of the machine — Away from the door, which moves the question to the sump.
- NEAR MISS — water standing inside the tub instead — That is a drainage fault and the drainage page is the right one.
Causes, most likely first on the COSDWV family
- Door gasket not seating — Ranked first here: it ranks first because it is visible, wipeable and the most common single finding on a machine leaking at the front.
- Drain hose joint under the sink — Second: the joint at the waste or the disposer sees water only at the drain step, which produces a leak that appears once per cycle and then stops.
- Sump or wash-pump seal — Third: a seal between the tub and the pump weeps under wash pressure and leaves water under the centre of the machine rather than at the door.
- Machine tilted forward — Fourth: these machines are meant to sit level or very slightly back.
- Inlet hose fitting at the valve or the tap — Fifth: the supply side is under mains pressure all the time, not just during the cycle, so a weeping fitting delivers water whether the machine runs or not.
- Over-sudsing pushing water past the seal — Sixth: it belongs high on the list because it is instantly reversible and because the foam is visible through the door in the last minutes of a cycle.
Check in this order, and why
- Run a finger round the gasket for debris or a hardened corner — Visible, wipeable, and the most common finding on a front leak.
- Watch the joint under the sink during the drain step — A once-per-cycle leak in a place people do not look.
- Note whether water appears under the middle of the machine — Centre rather than front moves the fault from the door to the pump.
Before you open anything
Safety
Power off at the spur, water off at the valve, then open anything. Those two come first because the wiring and the plumbing in this cabinet run alongside each other. Leave the door latch alone: defeating it lets a hot cycle run with the door open. Bail the water out before you tip the machine forward, and treat anything in the sump as sharp until you have seen it.
Models in the COSDWV family
Reference| Model number | Family key |
|---|---|
| COS-DWV24TTR | cosmo:dishwasher:cosdwv |
When to call a technician
The line is pressure and the sump. A leak that happens only during a wash and lands at the front is owner territory; a leak under the centre of the machine, or one fed by the house supply, is not. Bring someone in sooner if the floor under a fitted machine is damp with no visible source.
Other pages for this family and brand
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