Microwave makes loud noise and does not heat. Smell of light burning

Is there any holes burnt into the liner inside the micro wave.? Or burn spots showing.? If there is thow it out. It is not safe to be useing it.It could start on fire. That problem is from when they are not clean out once in a while. End food is burn,t onto the interior liner end grease end oil,

IF YOUR OVEN IS IN WARRANTY, GET MANUFACTURERS AUTHORIZED SERVICE; IF NOT, THE MAGNETRON IS THE SINGLE MOST EXPENSIVE PART IN THE OVEN

its time to get rid of it. Will cost more to repair than buying a new one.

The loud noise and no heat means that the magnetron has failed. It the part that generates the microwaves that heat the food. When it fails it shorts out, causing the transformer to heat up. That is what was causing the burning smell. The cost of a replacement magnetron is around $130-150 range so it may not make sense to have it fixed.

Loud hum is usually due to faulty hv diod, resonance capacitor, or the magnatrone feed thru capacitor , chk it with a ohm meter , one by one n replace it .. zaheer Islamabad

buzzinsg / humming / loud or louder than normal .is probably the mag / it has failed and the trans is making that noise . if older than 5 yrs I would replace ans the mag is 100.00 + and w / labor you have paid for a new on but have the old one .**** ..

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Chances are you have a bad magnetron.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa.

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

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 you and we'd appreciate your thoughtful rating of our answer.

It sounds like your magnetron has failed.

I would put a cup or so of water in it and heat it for about 3 minutes.

Then check inside and see if you smell any electrical burning or other smell.

You should have a 5-year warranty on the magnetron.

GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

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

The noise is coming from the high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. Its only affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!