Small fire n microwave

If you disassemble the unit check for a fuse

All Microwave ovens have a main fuse that is not accessible while the unit is mounted under a cabinet. Drop MW oven and replace the main fuse.

Depending on the model, there will be either a thermal cutout or thermostat on or near the magnetron. There is also one on top of the oven chassis ceiling, but under the outer cover.

The latter device acts as a flame sensor that cuts power to the oven in case of a fire.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.



At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Accessing some components (especially the oven cavity thermostat / thermal cutout) for testing and possible replacement will require you to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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If the model number is correct, there is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at pcappliancerepair.com based on the model number you listed this question under:


http://pcappliancerepair.com/model-display.php


The line fuse is listed as item 47.

You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

If the model number is correct, there is a small input line filter board with a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at pcappliancerepair.com based on the model number you listed this question under:

http://pcappliancerepair.com/model-display.php


The line filter is listed as item 1420. The fuse will be mounted to this board.

You can purchase replacement fuses at any hardware store. You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Slow Blow fuses are recommended.

If you have any questions, or need assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

There is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. Searspartsdirect.com has some excellent exploded view parts illstrations you can use to assist you in component location and assembly:

http://www.searspartsdirect.com/partsdirect/showSubComp.pd?imageUrl=http%3a%2f%2fc.searspartsdirect.com%2flis_png%2fPLDM%2fG4090153-00001.png


If the model number is correct, the fuse is listed as item 74 in this parts illustration.


If you have any questions, or need assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Below refers to the manuals which all contain the wiring diagram.

Microwaves: Inside the actual case. It is not consumer accessible. Over-the-range models have the manual behind the grille or control panel. 
http://www.geappliances.com/service_and_support/faqs/

A microwave casing can be removed and almost full access to the electronics with about 6 screws.... make sure to unplug it from the wall first.

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Sounds like it got hit with a power spike which could have burned out the low voltage components, (Control panel). How's your insurance coverage?

It probably put too much heat in the "innards" of the microwave and probably opened the thermostat or thermal fuse located inside -either on the chassis of the microwave or or the magnetron. If you or a friend is handy and wants to check and replace it, it's not a hard job as long as you play it safe. It will look something like the attached photo. In my profile you can find a link to my site where you can find critical safety & disassembly tips. There will be numbers on the side indicating the temperature and you can take the old one to a local appliance parts store to get a new one. NOTE: The one for the hood fan will read open at room temperature, so don't confuse it with the other two thermostats, which will read closed at room temperature. Post back if you need more help.