The short answer
Sparking, a tripped circuit or a burning smell: on an IKEA microwave that is usually arcing in the cavity, not a failed high-voltage section. Second, and worth checking in the same hour, is a damaged cord, plug or outlet. Most causes below are owner checks needing no tools and no panel off; the last is a service call.
What you are looking at
- The plug or outlet is warm — Warmth at the plug face after normal use.
- Visible sparks inside the cavity — Flashes during a normal cycle.
- A burning or hot-plastic smell — It arrives within a minute of starting.
- NEAR MISS -- a strong food smell only — Burnt food smells like a fault and is not one; clean the cavity and retest.
Causes, most likely first on this kind of unit
- Arcing inside the cavity — Metal trim on a dish, foil, a twist tie or a fork produces visible sparks. So does chipped cavity paint or a burnt waveguide cover, and those two are faults rather than mistakes. Ranked first: on an IKEA appliance on its mainstream OEM platform, most sparking is something in the cavity, and identifying which kind it is decides everything that follows.
- The cord, plug or outlet is damaged — A plug that is warm to the touch, a scorched outlet face, a flattened cord behind the oven or an extension cord all produce heat where there should be none. Placed here: a warm plug or a scorched outlet is heat where none belongs, whatever else is happening.
- Grease on the vents and the waveguide cover — Grease is fuel. On the waveguide cover it chars and then arcs; on the grilles it traps heat until a protector opens. Placed here: charring grease produces the smell and the sparking together.
- The high-voltage section or internal fuse — An internal fuse that blows repeatedly, or a failing high-voltage component, produces trips and smells that no cleaning will cure. There is no owner repair inside a microwave. Bottom of the list, deliberately: it is last because it is the one cause that is never owner work at any stage.
Check in this order, and why
- Look at where the sparks come from — Unplug it.
- Feel the plug and look at the outlet — Unplug first.
- Only after the cavity, vents and outlet are proven — Repeated trips or a burning smell with a clean cavity and a sound outlet means retire it or have it judged.
What an owner can safely check
- Stop the cycle and unplug it — Do this first for any spark, smell or trip.
About 5 min
- Check the cavity for metal, then inspect the waveguide cover — Remove metal and foil.
Tools: flashlightAbout 15 min
- Clean the grilles and restore the clearance — Clear grease from intake and exhaust, and give the oven the clearance its documentation specifies.
Tools: cloth, vacuumAbout 20 min
- STOP HERE -- never open the cabinet — The high-voltage capacitor can hold a lethal charge after the oven is unplugged.
Before you open anything
Safety
Unplug it first, and keep the cabinet closed: the high-voltage section holds a lethal charge after the power is off, so there is no owner repair inside a microwave. Damage to the door, hinge or seal face means stop using it now, not later.
When to call a technician
Call, or replace the oven, once the door, the outlet and the vents are ruled out.
Nearest pages of this class
What this page does not cover
This page covers the IKEA microwave as a class, not one family or model line. Where a family- or model-specific page exists for your unit it is the more specific answer -- go there first if your model is named. Deliberately not here: internal fuse ratings, high-voltage component part numbers and any cabinet-removal procedure, none of which belong in owner hands.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
