Symptoms
- Case feels noticeably warm or hot after or during use
- Vents may feel like they're blowing warm air, which is normal
- Hot spot may be limited to one specific area of the case
- Heat lingers much longer than usual after use
Likely causes
- CommonNormal heat dissipation through ventsMicrowaves vent some heat from the magnetron and transformer during operation, which is expected.
- PossibleBlocked or dusty vents restricting normal airflowReduced airflow can cause more heat buildup than normal on the case.
- PossibleCooling fan not working properlyIf the fan that helps dissipate heat isn't running well, the case can get hotter than usual.
- Less commonComponent overheating internallyA specific hot spot on the case, especially if new, could indicate an internal part running hotter than it should.
What to do
- Check that the vents on the back, sides, or top (depending on your model) aren't blocked by nearby items or built-in cabinetry.
- Dust off any visible vent openings with a soft brush or vacuum attachment.
- Listen for the internal cooling fan running during and briefly after use; if you don't hear any fan noise at all, this could point to a fan failure.
- Feel whether the heat is spread generally across the case (more likely normal) versus concentrated in one small hot spot (worth more concern).
- Give the microwave a few minutes of clear space and normal use to see if heat levels seem consistent with past experience.
- If a specific area is unusually hot or the cooling fan seems to not be running, have a technician inspect the ventilation and internal components.
Tools and parts
- Soft brush or vacuum
When to call a pro
If a cooling fan seems absent or a specific hot spot develops, have a technician inspect the ventilation and internal components.
Safety
Use caution
A specific, unusually hot spot on the case (rather than general warmth) can indicate an internal issue worth having checked promptly.