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When you start a cooking cycle, does it sounds the same as it always has or is it much quieter or make odd noises (loud buzzing/growling)?
Great, thank you. Do you have any electrical testing equipment, specifically, a clamp on meter to measure current draw?
Most people wouldn't but I figured I would ask! :-)
Please allow me just a few minutes to prepare some information for you, thank you!
If it sounds the same as it always has, the magnetron is likely faulty. The only way to know is to measure the current draw. It could be that the control is not energizing the high voltage components or a high voltage supply issue but usually that is noticeable by a quieter sound. If you have no way to test and want to attempt to repair it yourself, I would replace the magnetron. It may still be under warranty, though, if replaced less than a year ago.
It is pretty easy to replace, you will need to remove the outer cabinet to access it. There are four screws and 2 wires, so it is easy to replace once you access it. There is a high voltage capacitor in there, though, so after it has been unplugged you will want to be sure to short across its terminals to discharge it before you remove the wires. I will see if I can locate that part for you. Please allow me just a few minutes to prepare some information for you, thank you!
The link below is to the part you will need.
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It has been emailed, thank you!