Unplug it
Stop using it.
Microwave runs but does not heat food?
A microwave that runs but leaves food cold usually has a failed magnetron, diode, capacitor or door switch. These parts are high voltage. Unplug it and call 833-877-1717. RepairNowUSA connects the request. An independent appliance technician does the repair.
Am I in the right place?Yes for a microwave that runs, lights and turns but does not heat.
Is this urgent?Not an emergency unless it sparks or smells burned.
What do I do next?Unplug it and call 833-877-1717.
Sparking: microwave sparking.
RepairNowUSA editorial review · Last substantively reviewed October 13, 2026 · Review standards
What to do now
Test with water
A cup of water for one minute should get hot. If not, it is not heating.
Do not open it
High-voltage parts stay charged.
High voltage inside
Never open a microwave case. The capacitor can deliver a lethal shock even when unplugged. If you see smoke or flames, or sparking that does not stop, get out and call 911.
Common causes
Magnetron
Most common.
High-voltage diode
Often fails with the magnetron.
Door switch
Partial failure.
Capacitor
Weak or failed.
What to have ready when you call
- Property ZIP code, home or business
- Brand and model number (usually inside the door or on the back)
- Countertop or over-the-range
What happens when you call RepairNowUSA
- Describe what is happening in plain words and give the property ZIP code. You do not need to know which trade to ask for.
- RepairNowUSA checks for a participating independent provider who handles microwave repair in that area.
- If one is available, you are connected. The provider confirms timing, access, scope and price with you before any work.
- The provider, not RepairNowUSA, diagnoses and performs the repair.
RepairNowUSA is a referral and connection service. Provider availability and response times vary by location, time and demand, and are not guaranteed. Before you approve work, ask what was found, the price, the timing and what is not included.
Call 833-877-1717Microwave runs but does not heat food questions
Why does my microwave run but not heat?
Usually the magnetron, diode, capacitor or a door switch.
Can I call at night or on a weekend?
Yes. You can call 833-877-1717 at any time, including nights, weekends and holidays. Whether an independent provider can come out right away depends on your ZIP code, the time and provider capacity, so availability is not guaranteed.
Authoritative references
These public sources give general safety context. They do not replace an on-site evaluation, and RepairNowUSA does not perform the work.