The short answer
A Black+Decker microwave showing this usually tells you one thing: the useful thing to know about a countertop oven is which faults are outside the case and which are behind it. Everything outside the case is owner work. Everything behind it is a service call or, more often on a compact oven, a replacement.
The problems, one entry each
- Runs but does not heat — A full cycle with cold food at the end. The not-heating page starts with the door latch and the cup-of-water test, because both are free and both explain most of these.
- Will not start at all — A lit display with a dead start button. The will-not-start page separates the supply from the door circuit from the keypad.
- Sparking, smells and tripping — A warm plug or repeated tripping. The electrical-safety page checks the circuit before it blames the oven.
- Door, latch and seal — A door that will not click shut, a gap at one corner, or a latch that needs pressure. The door page treats all three as containment findings rather than annoyances.
Problem classes in frequency order
- Runs but does not heat — Leads the ranking — It leads because it accounts for more of these calls than anything under it, and its first check is free.
- Will not start at all — Close behind — Ranked here on how often it turns out to be the answer once the free checks above have been done.
- Sparking, smells and tripping — A step down — Common enough to check early, and cheap enough that being wrong about it costs nothing.
- Door, latch and seal — Further down — At this position because the entries above are quicker to settle, not because it happens less.
- Noise and vibration — Infrequent — Regular rather than frequent, and worth reaching only once everything above is genuinely clear.
- Controls, display and error codes — The long shot — Occasional, and the one owners reach first because it is the entry with a part attached to it.
Share per problem class
General guidance| Problem class | Share of jobs | Basis |
|---|---|---|
| Runs but does not heat | not measured for this brand | ranked first by field experience |
| Will not start at all | not measured for this brand | ranked second by field experience |
| Sparking, smells and tripping | not measured for this brand | ranked lower by field experience |
| Door, latch and seal | not measured for this brand | ranked lower by field experience |
| Noise and vibration | not measured for this brand | ranked lower by field experience |
| Controls, display and error codes | not measured for this brand | ranked lower by field experience |
Which of these an owner can fix
Stop and call when the next thing to do meets any of these. Anything involving the door, its screen or its latch is a stop-using finding rather than a repair to postpone. Everything else divides by whether the next step is behind the case.
Sources
General guidance- The Control of Hazardous Energy (Lockout/Tagout) — OSHA 1910.147 and manufacturer service manuals, fetched
- Article 210 — Branch Circuits — NFPA 70 (National Electrical Code), fetched
The same page for other brands
What this page does not cover
Treat what follows as the class-level answer for a Black+Decker microwave. It will not tell you which board your unit has, which part number fits it, or what a particular code means on a particular family, because those differ within the range. The family and model pages beneath this one carry that, and they are linked under 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.
