Microwave runs but doe not heat

William Miller

• 9179 Answers
• Posted on Dec 04, 2007

SOURCE: GE Profile Spacemaker® XL1800 Microwave Oven

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should be a very helpful "mini-manual" hidden inside the unit behind the control panel.

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

SOURCE: oven part works fine, microwave runs but doesnt heat

bad micro switch in door handle, 79.95 for GE man to check,9.61 for the part and changed it myself

SOURCE: turns on but not heating food sounds a bit louder

Hi, this is common in most microwaves. this abnormal noise is coming from a faulty Magnetron. this device is responsible for the heating process and, it is damaged and not heating at all at this point.Simply replace the Magnetron and, this unit will start to heat once more.

SOURCE: ge spacemaker xl 1800 - no heat

HI, the loud popping noise was the Magnetron tube. this is the main heating device. the noise filter is also damaged and, should be replaced as well.

In conclusion, replacing the Magnetron tube and noise filter will fix this unit.

SOURCE: loud pop and microwave doesn't heat anymore

I have a GE Profile Spacemaker model JVM3670WF001, purchased I think in 2003. Pop sound, no Heat. Light goes on, carousel goes around,
Repair or new microwave