Question about Frigidaire GLMB209D Microwave Oven

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Where is the fuse?

My Frigidaire Microwave oven doesn't heat, but everything else works fine. I want to check the fuse. Where do I find it? Thanks.

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Re: Where is the fuse?

It won't be the fuse. If the fuse were out, it would be completely dead.

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, linked here on Fixya:

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

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

Posted on Nov 28, 2007

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Fuse location

Good Afternoon Friend, that's a great question!

Depending on the model of your Frigidaire microwave, the fuses are typically on located behind the control console, on the magnetron or on the oven capacity. However, if your microwave does not heat, you may possibly have a faulty control panel, magnetron, or experiencing an issue with the power supply. Please confirm that your microwave is plug into its own outlet and that you are not using a GFI outlet. Hope this helps! - Z

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see this causes and fix it. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.
Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.


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see this causes and fix it. God bless you
If your microwave oven doesn't seem to work at all, check these: Fuses Door switch Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it. Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work

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Oven not working. Replaced an element, but oven will not heat up. The stovetop works fine, but the oven does not heat up.

check the continuity or resistance.
Now if its zero reading try to check your termination and also check the fuse or thermal cut out or thermal overload if it is busted or burn try to used also your tester.
But if there a resistances try to reset.

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Need more help ... post a comment here

thanks for using

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Appears normal

ya this is the same problem i too had...everything will seem to right but the part required for heating might be damaged internally...try changing i did the same...

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