Question about Sunbeam SMW777 Microwave Oven

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The microwave will not heat what could be the issue?

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

Microwave Oven Basic Troubleshooting Tips

heatman101 .

Posted on Oct 14, 2010

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2 Answers

Microwave won't heat food. Everything else works on it


Most likely it is a bad magnetron tube (the heart of a microwave oven - it's the part that generates the microwaves). If the microwave oven is not under warranty or not covered by a service contract or home-repair contract, then it will probably cost more to fix it than it is worth.

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Hello - If the microwave does not heat, it could possibly have a faulty control panel, magnetron or an issue with the power supply. Contact a professional to move forward accurately.

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I bought my microwave last year,It had been working but suddenly will not heat, the light comes on table turns and sounds like it is on but will not heat? please help


Repolace the microwave, the heating components like the magnatron would cost almost as much as a new microwave. If money is an issue try Goodwill, they usually sell microwaves for about 5-10$ which is WAY less than cost of parts.

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Whirlpool oven


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

Jun 22, 2009 | Whirlpool GH4155XP Microwave Oven

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My oven started arching with micowave popcorn (4 or 5 different times). Now it will not heat. No error messages on the screen and everything else works. Thanks Dennis M.


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

Jun 21, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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Microwave not heating


The Magnetron has stopped working in this case and, you will need a replacement Magnetron heating device. this will fix your heating issue.

Replace the Magnetron. Runs about a 160.00 or maybe cheaper in most cases.

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Whirlpool Gold Accuwave wont heat


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

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1 Answer

Ge spacemaker runs but wont heat


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

Jan 16, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Wont heat


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

Jan 15, 2009 | LG LMV1314 Microwave Oven

1 Answer

Amana Microwave, MVH320E Popped


This is usually caused by a blown high voltage rectifier diode.

Here are some links you or someone you know can use for test help, but read their safety warnings first:






line-height:normal">mso-fareast-font-family:"Times New Roman""> http://www.microtechfactoryservice.com/diode.html



line-height:normal">mso-fareast-font-family:"Times New Roman""> http://www.microtechfactoryservice.com/mag_test.html



line-height:normal">mso-fareast-font-family:"Times New Roman""> http://www.microtechfactoryservice.com/xformer.html





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

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

Jul 01, 2008 | Amana AMV1162 Microwave Oven

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