My delonghi microwave mm821aan-x2 is not heating. the turnstable is working and the light too....is it a part i need to make it work?

Check this video it goes through checking and replacing magnetron, capacitor, diode and fuse. It will be one of those. Check the safety instructions in the description.

From your description it is the magnetron that heats the food that has gone, I suggest that you take it back for a refund, because if you decide to fix it the repairs will run you more than what the microwave oven is worth.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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in most cases the magnatron has gone bad as they are very expensive in most cases we write them off . sorry i think its time for a new microwave

best wishes

sonic boom electronics

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

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

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

Basic Microwave Oven TroubleshootingTips

heatman101][][]\

If your handy with getting the cover off and looking inside... check the obvious.
I suspect :
fuse
thermister
relay
If both microwave and Heating elements dont work, then I will assume the magnetron is ok, ans we are dealing with a high voltage issue... and you will need at best... a volt meter and or neon troublelight...
moust appliances have a simple schematic inside... I would start with the heating element first... trace wiring back to circuit board... usually one side of the heating element is connected to the white wire (neutral) and live (Hot) side is controlled thru the circuit board... so finding the neutral should be easy... then trace with neon light or voltmeter...

I know easy for me to say... but with everything else working... it doesnt seem to be the microprocessor that controlls the unit...

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/lisa_52daba487e5b4d53

Mag tube Shot

Found this posted in GE instead of DeLonghi but the basics are the same.

You say it stopped working - you mean it runs but doesn't heat?

check  highvoltage circuit and magnetron and diodes and condencer and related parts, control circuit also check.