The short answer
Water under or inside a BUF cabinet is nearly always condensate that has failed to leave rather than a supply leak. These cabinets produce condensate constantly and route it to a small tray, so anything that blocks that path puts the water on the floor instead.
What you observe
- Damp or wet food at the back of a shelf — Condensate running down the rear wall before it reaches the drain.
- Beads of water around the door opening — Warm room air meeting a cold surface. This is a seal or a door-alignment story rather than a plumbing one.
- A sheet of ice on the cabinet floor — Water that pooled and then froze where it stood. It means the drain has been blocked for a while, not that the unit has suddenly started leaking.
- Standing water inside, under the bottom shelf or drawer — Condensate that has not reached the drain at all. This is the commonest form on a compact cabinet.
Causes, most likely first
- A blocked condensate drain — First on this family by a wide margin. The drain hole in the cabinet floor is small, it sits where crumbs and label paper collect, and once it closes the water has nowhere to go but forward and out.
- A door seal that is letting warm air in — Second. Warm humid air reaching a cold cabinet condenses on everything it touches, and on a compact unit with a light door a seal that has taken a set produces a steady supply of water rather than an occasional bead.
- Frost melting off the evaporator in a lump — When a frost sheet finally lets go it arrives as more water at once than the drain can take, so a cabinet with a frost problem leaks intermittently rather than steadily.
- Uncovered food and frequent door opening — Every open door delivers humid room air, and uncovered liquid supplies more. On a small cabinet this is enough to overload a drain that is otherwise working.
Check in this order
- Find where the water starts, not where it ends — Dry everything, put paper down at the front and the back, and see which wets first.
- Close the door on a strip of paper at several points around the opening — A seal that does not grip explains a steady supply of condensate without anything being blocked at all.
- On a plumbed model, dry the fittings at the back and watch them — Last of the owner checks, and only relevant on the models in this family that carry a water connection.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. If the unit stands on a circuit shared with other outlets, isolate at the breaker rather than at the plug, because water on the floor around a plug is exactly the situation the breaker is there for.
Models in the BUF family — The models this page covers, as the product spine lists them. The table resolves to more than one model stem, so confirm yours in it before assuming a neighbour fix applies.
Reference| Model number | Family key |
|---|---|
| BUF1000LB | black-decker:refrigerator:buf |
| BUF1000LS | black-decker:refrigerator:buf |
| BUF1000LW | black-decker:refrigerator:buf |
| BUF850LB | black-decker:refrigerator:buf |
| BUF850LS | black-decker:refrigerator:buf |
| BUF850LW | black-decker:refrigerator:buf |
When to call
Call when the drain is clear, the cabinet is level, the seal grips and water still appears. That combination points at a cracked channel, a failed fitting or a frost problem with a cause of its own, and all three are behind a panel.
Other faults on 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.
