The short answer
When a Black+Decker refrigerator does this, a tone with no code is nearly always a door alarm or a temperature alarm, and the door switch is the first thing to check. The door switch test takes seconds and needs nothing; anything past it is a wiring question.
What you actually see
- Buttons do nothing, or one button does nothing — A single dead button is a membrane failure; a whole dead panel is a supply or board failure.
- The display flickers or shows partial digits — Missing segments point at the display itself rather than at the logic behind it.
- The unit ignores the temperature dial entirely — Turning the control makes no audible change in the compressor over an hour.
Causes, ranked for this refrigerator
- Door switch stuck or misread — Leads the ranking — a plunger that sticks in the closed position leaves the machine convinced the door never opens, and one stuck open leaves the alarm live. Where this checks out clean, treat the next entry as the working theory rather than a possibility.
- Power interruption left the control in a bad state — Close behind — a brief outage or a switched outlet can leave a simple controller mid-cycle, and it is the single most common reason a panel behaves strangely on these units. A clean result here does not just remove one part; it removes everything that depends on it.
- Temperature sensor open or shorted — A step down — the machine can only report what it measures, so a sensor at the end of a chafed lead produces a code that looks like a board failure. It is worth being sure about this one rather than half-sure, since everything after it assumes a verdict.
What to check, in order
- First — the door switch — Press and release the plunger with the door open. It should move freely and click, and the lamp should follow it exactly.
- Second — a power cycle — Note whether the fault returns immediately or takes days. An immediate return rules the power cycle out cleanly.
Checks an owner can do safely
- Step 1. Reseat the visible connectors — With the unit unplugged, unclip and refit each connector at the control once, looking for corrosion on the pins.
Tools: screwdriver, flashlightAbout 25 min
- Step 2. Write down the exact code and when it appears — Note the characters shown, whether cooling continues, and what the machine was doing. That record is what shortens the service call.
Tools: pen and paperAbout 5 min
- Step 3. Check for a control lock or a display mode — Hold each button for several seconds and watch for a lock symbol or a mode indicator. Two buttons pressed together is the usual unlock sequence.
Tools: noneAbout 10 min
Before you open anything
Safety
Power comes off first, every time: pull the plug, or switch the breaker for that outlet. A capacitor can hold a charge after the power is off. Keep the cord where you can see it so nobody plugs it back in while your hands are inside, and never operate the unit with its cover removed.
When this becomes a service call
The line is not about confidence, it is about what the next step needs. A code that persists across a full power cycle and a clean sensor comparison is a board or a harness fault, and both are diagnosed with a meter on a live machine.
Sources
General guidance- The Control of Hazardous Energy (Lockout/Tagout) — OSHA 1910.147 and manufacturer service manuals, fetched
Nearest pages
What this page does not cover
Read this as generalized information. It is accurate across the Black+Decker refrigerator range, which is exactly why it stops short of the detail a single family or model deserves. If a family-level or model-level page exists for your unit, that page supersedes this one on wiring, part numbers and error-code meanings; the links under Related pages are where those pages live.
Related pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
