The short answer
When a BUF unit runs continuously and the food is still warm, treat it as a heat-rejection fault first. The condenser on these cabinets sits where the owner cannot see it and the clearance around it is tight, so the same dust layer that a full-size refrigerator shrugs off stops this platform cooling altogether.
What you observe
- The unit never stops running — A cabinet that cannot reach its setting runs without a break.
- The cabinet is warm while the unit is clearly running — You can hear or feel the compressor working, but the air inside never gets cold.
- It runs for a short spell, stops, and starts again quickly — Short cycling is a different pattern from continuous running and points at the start components or at overheating rather than at airflow.
- Sweating or condensation around the door opening — Warm room air is reaching the cold surface, which means the seal is not closing along its whole length.
Causes, most likely first
- A condenser coil or grille blanketed in dust — Ranked first on this family. The condenser is small, it is close to the floor or the wall, and the clearance around it is measured in fingers.
- A door seal that no longer grips along its whole length — Second, and the cause owners most often miss. A compact cabinet loses its whole reserve to a small leak, and the seal on a light door takes a set if the unit has been transported or stored shut.
- A sealed-system or compressor fault — Last, and the reason the order above matters. It is the least common of these causes on this family and the only one that is not owner work at all - refrigerant is licensed work.
- A failed evaporator or condenser fan — On models that use a fan rather than free convection, a fan that has stopped gives exactly the warm cabinet of a blocked coil, with no dust to show for it. Listen for it before opening anything.
Check in this order
- Feel the back of the cabinet for heat while it runs — A unit that is working but cannot shed heat feels hot at the back; one that is not pumping at all does not.
- Close the door on a strip of paper and pull it out, at several points around the opening — On a compact cabinet the seal is the cheapest real cause, and this is the fastest honest test of it.
- Look at the inside rear wall for a frost sheet — Only worth doing once the door and the coil are clean, because both of those cause frost themselves.
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. These cabinets are light enough to move alone and heavy enough to tip - empty it first, and pull it out rather than walking it on its corners.
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
The line on this family is the rear panel. Everything in front of it - the setting, the load, the seal, the grille, the clearance - is owner work and needs no tool.
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.
