The answer, before the detail
A leaking Black+Decker BUC freezer usually means a blocked drain, a seal that has been letting warm air in, or the aftermath of a defrost. What separates them is timing: water after a defrost is an event, water that returns on its own schedule is a fault. This page works in that order. The BUC key covers more than one build, and for this fault the difference shows in whether your unit has a drain plug low on one wall.
What you observe on these models
- Water on the floor under the cabinet — Either the drain path is full or the pan underneath is displaced.
- Wetness at one low corner — A plug not seated, or one that was left out after a defrost.
- A one-off puddle with an obvious cause — That is an event, not a fault, and it should not repeat once the cabinet is back to temperature.
- NEAR MISS — soft food with the water — Fixing the water without the cold fixes nothing.
Most likely first on this family
- The drain path is blocked or the plug is not seated — It ranks first because it is the only part of a freezer explicitly designed to carry water, and the only one that can therefore lose it. Water that stands and refreezes inside is this cause seen from above.
- The seal or the closing action is letting warm air in — Second, and it rises on chest builds where a basket or a packet proud of the rim holds the lid open a fraction all day. Frost concentrated at one part of the opening points at where the air comes in.
- The drain pan is displaced, cracked or overfull — Mid-list, and it climbs when the floor is wet but the cabinet inside is dry. Everything upstream works; the water simply is not being caught.
- Meltwater from a defrost, a door left open or a power cut — Ranked by timing rather than by likelihood: if the water followed an event, it is not a fault at all and nothing below needs doing. It should not come back once the cabinet has recovered.
- An internal drain hose or the evaporator tray behind the panel — Last, because confirming it means a panel coming off and that ends the owner half of the job. Water appearing inside the cabinet walls rather than on its floor is the giveaway.
The order that finds it fastest
- Find the drain for your build — You cannot check a drain path you have not found.
- Check the lid or door pulls itself shut — A paper strip should drag all the way round; frost at one corner marks where it does not.
- Check what is meant to catch the water — Displaced or cracked explains a wet floor with a dry cabinet.
Power off first
Safety
Power off at the plug or the breaker before opening anything; a capacitor can hold a charge after the power is off. Do not defeat the lid or door switch to watch a fan run. Empty the cabinet before you move it — a full chest freezer is far heavier than it looks, and the injuries from moving one are worse than the fault being chased.
When to call a technician
The line is the panel. Everything in front of it — plug, trough, seal, pan, load — is yours; anything behind it is service work. Book rather than improvise if the cabinet is heavy, full and in a tight space, because moving one badly costs more than the repair.
Other faults covered for the BUC models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
