I have a GE Spacemaker XL1800 and everything works on it except it doesnt heat or cook when turned on. Its about 5 yrs. old. Can it be fixed or should we just replace it?

Is this an over the stove type unit? I have had a few problems with my over the range spacesaver. I think the heat from cooking gets up into the microwave and damages it. The steam from me boiling things on the stove had mine quit heating and I purchased a new one. The parts to replace the faulty ones can be quite expensive over $150.00, so its better to purchase a new microwave.

the microwave doesnt heat or cook popcorn

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

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magnetron problem DON'T KNOW IF WITH FIXING - WOULD LIKE TO KNOW MYSELF

MAGNETRON, 99% of the time with your complaint

Use a hair blow dryer to dry out the underside of the microwave. After you are convinced that it is dry you may operate it again.

That said, if it still is acting up read this:

When the microwave sounds okay, but there's no heat, one of the internal door switches, the high voltage circuitry, or the circuit board may have a problem. To resolve this problem, you need the assistance of a qualified appliance repair technician.

the magnetron needs replacement my friend, although you can still heat up food but eventually it will soon fail.
appreciate your kind comment

I think you should check the fuse first that runs the magnatron if the fuse is good that means the magnatron is bad! but if its only the fuse then you save time and money!

You either have a bad magnetron tube (5 or 10 year parts warranty item through GE Factory Service 1-800-432-2737 or www.geappliances.com) or a shorted high voltage rectifier. I think the light being out is a secondary problem.

have a GE xl1800 microwave that is not heating the food. The lights work, turntable turns etc. all but no heat. Help this microwave is only 1 years old.