Microwave Fridigaire, model no. MWV150KBA, manufactured date: 9/09. Ths is my third frigidaire microwave in a little less in two years. Yesterday, 10/23/10, my son was heating something up. It worked, he closed the door and this humming noise started. It was like it was on, but not. At first we put up with the noise then realized after about 3 minutes, my microwave cover for plates, you leave in the microwave, was melting. Heat. So, for fire safety reasons we unplugged the microwave. What's up with Fridigaire products. My husband is calling them today, I'm just curious is this a frequent problem? What is causing this all of a sudden?

SOURCE: Frigidaire Professional series microwave won't heat

The most likely problem is the magnetron. Check your warranty in owners manual, I believe you have five year warranty on magnetron.

SOURCE: My Frigidaire over the stove microwave not heating food

Hi,It is most likely the magnetron and diode that has to be replaced. This job should be done by a tech, High voltage. Magnetron's normally have a five year warranty, check your owners manual.

William Miller

• 9179 Answers
• Posted on Jan 31, 2010

SOURCE: My Microwave oven makes a loud buzzing noise and

Quite often this is due to grease or food particles stuck somewhere in the cavity of the oven or stuck on or behind the waveguide cover.

The waveguide cover (also called a spatter shield) is usually on the right side of the cavity and is about the size of a playing card and often held in place by a plastic rivet.

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If your waveguide cover is burned, it will need to be replaced.

It provides critical protection for the magnetron.

Your owner's manual may show you how to remove the cover.

You can download owner's manuals and installation instructions for Electrolux and Frigidaire here.

Otherwise, you can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

SOURCE: Fire in Frigidaire Electrolux Microwave PLMV168CC1

Turned on high empty for 20 minuets

SOURCE: My Frigidaire microwave is less than a year old.

The symptoms of loud noise and no heat indicate a short in the magnetron or high voltage diode. Need to take it to a qualified repair, to figure out what the problem. The magnetron replacement can cost as much as a new oven. See what the warranty covers, maybe you might luck out.