The short answer
Arcing, sparking or a burning smell from the SMD line is a stop-now symptom rather than a diagnose-carefully one. Disconnect the appliance, leave it disconnected, and have it seen: everything on this page is about recognising the symptom correctly and not about repairing it.
What you observe
- Visible sparking inside the cavity during a run — On the models listed in the table on this page, most often metal in the cavity or damaged interior finish, and the appliance should be stopped at once either way.
- A burning or electrical smell — A component running hot or failing under load, and a reason to disconnect the appliance rather than continue.
- The appliance trips the household breaker — An electrical fault rather than a performance one, and resetting it repeatedly is not a diagnostic step. The models in the table behave the same way here.
- Scorch marks inside the cavity or on the cover plate — Evidence of previous arcing, and it usually names the location of the problem precisely.
- A loud buzz or hum that was not there before — A change in the running sound alongside any electrical symptom points at a component under stress.
- NEAR MISS: the unit is silent and does nothing — That is a no-start fault and the will-not-start page for this family covers it.
Causes, most likely first
- Metal in the cavity — First on the SMD line because it is the most common cause of sparking by a wide margin and because it is entirely a user matter: foil, a twist tie, a metal-rimmed plate or cutlery left in a dish all arc. That holds across every model this page covers.
- A damaged or displaced interior cover plate — Second because it is common and often follows cleaning: the plate is fragile, it is easily cracked with a scourer, and a damaged one arcs against the cavity. That is true of every model this family spans.
- Food residue burnt onto the cavity or the plate — Carbonised residue conducts and arcs, which is why a unit that has never been cleaned begins sparking in the same place each time.
- A dish or container that is not microwave-safe — Some decorative glazes contain metal, and some plastics break down under load. Both produce arcing or smells with a perfectly healthy appliance.
- Any internal electrical fault — Terminal for owner purposes without exception: the high-voltage section stores a hazardous charge long after the appliance is unplugged, and there is no safe owner-side inspection of it.
Check in this order, and why
- Stop the appliance and unplug it immediately — First on the SMD line and not negotiable: every other check on this page is made with the unit disconnected. It is the same on all the models in the table on this page.
- Look for metal in the cavity — Foil, a twist tie, cutlery or a metal-rimmed dish, and it is the cause in the large majority of sparking reports.
- Inspect the interior cover plate for damage — For every model in this family, a cracked, missing or displaced plate arcs against the cavity, and it is frequently broken during cleaning without the owner realising.
Before you begin
Safety
Unplug the appliance immediately at the first sign of arcing, burning smell or a tripped breaker, and leave it unplugged. A microwave capacitor can hold a dangerous charge long after the unit is disconnected, so no panel is ever removed by an owner.
Models in the SMD family
Reference| Model number | Family key |
|---|---|
| SMD2489ES | beko:microwave:smd |
When to call a technician
Call as soon as arcing, a burning smell or a breaker trip persists with a clean, empty cavity and an undamaged cover plate. On the SMD line that is an internal fault and the owner sequence ends there. The same is true of each model covered here.
Other problems on the SMD line
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
