How to Fix a Microwave Not Heating
Quick Answer
Check the door switches, test the magnetron, and check the high voltage diode.
How to troubleshoot a Microwave Not Heating
A microwave that won't heat is often due to a faulty magnetron. This guide covers diagnosing and fixing the issue.
Step-by-Step Fix
- Unplug the microwave and remove the outer cover.
- Check the door switches with a multimeter.
- Test the magnetron for continuity - if faulty, replace it.
- Check the high voltage diode.
- Reassemble and test the microwave.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| No heat | Faulty magnetron | Replace the magnetron. |
| Sparks | Waveguide or diode fault | Check waveguide and diode. |
Frequently Asked Questions
Is it safe to repair a microwave myself?
Only if you are experienced; high-voltage components can be dangerous.
What causes a microwave to stop heating?
A faulty magnetron, diode, or door switch.