The short answer
When a BUFK 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
- A sheet of frost on the inside rear wall — A light dusting is normal. A solid sheet means the air path is closed and cold is no longer moving into the cabinet.
- 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.
- One compartment is cold and the other is not — On models with a separate freezer section, cold in one and warm in the other points at airflow between them rather than at the compressor.
- 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.
- Start relay or overload protector — A compressor that will not start, or that starts and drops out again after a few seconds, is usually its start components rather than the compressor itself. The tell is the short repeated cycle rather than continuous running.
- 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.
- Too little clearance, or a warm location — Placement is a genuine cause on this platform, not an excuse. Pushed tight to a wall, boxed into a cabinet run, or standing in a warm utility space, these units have nowhere to put the heat they remove.
Check in this order
- Look at the condenser grille and the space behind the cabinet — Dust here is the first-ranked cause on this family, and the check needs a torch and nothing else.
- Put a separate thermometer in the cabinet and read it after some hours — It separates a cabinet that is genuinely warm from one whose control display is wrong, and it costs nothing.
- 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. Do not attempt anything on the sealed system: the refrigerant circuit on this family is brazed closed, it carries no service ports an owner can use, and opening it is licensed work.
Models in the BUFK family — The models this page covers, as the product spine lists them. This family is a single model, so there is no variant to rule out before you start.
Reference| Model number | Family key |
|---|---|
| BUFK12W | black-decker:refrigerator:bufk |
| BUFK12W | black-decker:refrigerator:bufk |
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.
