Microwave makes a thumping sound then no heat

Most likely causes - shorted high voltage rectifier, or failed high voltage transformer, or shorted high voltage capacitor, or shorted magnetron. If an odor accompanied the failure, high voltage rectifier or transformer most likely. All of these components operate on 4000 v, or more - with enough current to kill you. Make sure the unit is unplugged, and the high voltage capacitor is fully discharged before testing.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

change magnatron fuse its in a plastic casing make sure it correct fuse .

I called a technician out today. Seems like the problem is the circuit board. It wasn't working properly and the sound is the fan. The fan is supposed to turn on when the microwave is in use and off when it is not. In this case, the fan continued even when the microwave was not in operation. A new circuit board has been ordered and will replace the old one when it arrives. For now, I can still use the microwave, but I have to unplug it everytime I finish heating something up. A little inconvenient, but at least it'll still heat my food up in the meantime.

Once i opened up the microwave, I found that some kind of capacitor or something (had two wires going to it) had fell down on top of the fan. I had to rig the plastic mounting bracket and re-attach it to a panel inside. That took care of the rubbing noise. It turned out that some one had unplugged the wire that powered the turntable. That took care of that. it seems to work fine now. Steve

It sounds like the table is'nt positioned properly on the base it sits on, most are not attached and can be easily removed for cleaning purposes, try repositioning the table on the base.

maybe your magnetro is leaky

Is it a rhythmic thumping, or intermittent, or one thump when it first starts?

If it's rhythmic, it may be a failing turntable motor or stirrer.

If it's a thump just when you hit Start or when the magnetron turns on at the beginning of the cook cycle, it may just be a common noise that they sometimes make due to the magnetic field produced by the high voltage transformer.

Please write back with more details if you need further help.

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

check highvoltage crcuit ,and check fan, and turntable motor,

If the turntable tray is positioned and seated properly, it is probably a failing turntable motor. You can find usually helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383 If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk