Stop
A microwave fire is a serious hazard. Keep the door closed, turn off or unplug the unit, and evacuate and call 911 if the fire doesn't quickly go out or smoke is heavy.
Symptoms
- Visible flame or smoke inside the microwave
- May follow overheating popcorn, a food item left too long, or metal causing sparks
- Smoke alarm may go off
- Microwave may or may not still be running
Likely causes
- CommonFood overheated well beyond a safe timeVery dry or small food items can scorch and ignite if microwaved far too long.
- CommonMetal or foil sparking and igniting nearby materialSparks from metal can catch paper towels or food packaging on fire.
- CommonPopcorn bag left in far longer than the recommended timePopcorn is a frequent cause of microwave fires when overcooked.
What to do
- Keep the door closed and turn off or unplug the microwave immediately; a closed, powered-off microwave usually starves the fire of new energy and can help it burn out.
- Do not open the door while there is an active flame, since introducing oxygen can make it flare up.
- If the fire doesn't go out within a short time or smoke is heavy, evacuate and call 911.
- Once you're confident the flame is out and the unit has cooled, open the door and ventilate the kitchen.
- Inspect the interior for damage like melted plastic, scorch marks, or a damaged wave guide cover.
- Do not use the microwave again until you've confirmed there's no lasting damage to the interior or wiring; when in doubt, have a technician check it or replace the unit.
When to call a pro
After any fire, even a small one, have a technician inspect the microwave for damage before using it again, or consider replacing it.
Safety
Stop
A microwave fire is a serious hazard. Keep the door closed, turn off or unplug the unit, and evacuate and call 911 if the fire doesn't quickly go out or smoke is heavy.