If your microwave runs but doesn’t heat, it’s usually a magnetron, door switch, or power issue.
Common causes
- Faulty magnetron
- Door not closing properly
- Incorrect power setting
- Blown internal fuse
1. Faulty magnetron
The part that creates heat.
Quick fixes:
- Test with a cup of water
- Listen for unusual buzzing
2. Door not closing properly
Microwaves won’t heat unless fully latched.
Quick fixes:
- Clean the door latch
- Check for food debris
3. Wrong power setting
Easy to overlook.
Quick fixes:
- Ensure it’s set to full power
- Reset the microwave
What to try first
Test with a cup of water — it shows instantly if it’s heating.
When to call a professional
If the microwave runs but stays cold.