It was working fine last night now it is making loud noise and not heating...

If there's a loud noise when you try to microwave food, then the current through the high voltage transformer is probably too high.
Most likely, this is being caused by failure of a component in the high voltage circuit. The most likely component is the high voltage rectifier, followed by the magnetron or high voltage capacitor. High voltage transformers occasionally do burn up as well.

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

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heatman101

Since the unit makes the noise on Microwave but not convection it is a problem it he Microwave Circuit. Probably in either the rectifier of bad mag, one of them shorted. Just looked at the date you posted this, Im sure you have fixed or replaced this by now

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.

We have the same exact microwave & this happened with ours just last night. I'm wondering the same if it is worth having it fixed.

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

Basic Microwave Oven TroubleshootingTips

heatman101==]-]=-

In all likelihood the mangnetron has failed, or perhaps even the Power Supply. You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

hello Frank. Sorry to tell you that the magnetron is going bad and making that terrible noise. Since the inside of a microwave, even unplugged has up to 2000 residual and deadly volts of electricity I recommend either calling a pro or replacing the unit.

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

Microwave Oven Basic Troubleshooting Tips

heatman101

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Could you describe the noise?

It may be a noisy fan motor or a failing magnetron or high-voltage transformer.

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