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Re: Gold Star 1515W microwave not heating up and when
The magnetron (the part that heats the food) may be bad or the circuitry to the magnetron may have burned out. Basically my advice is that if you have no electrical expertise, it isn't worth fixing. The magnetron if bad, costs almost as much as a new microwave. If you open it up (make sure it has been unplugged for a few hours and don't seen any obvious burnt parts, then most likely the magnetron is done and a new microwave is the way to go.
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Please do not take offence to this answer. Please seek the advice of a qualified person because the capacitors in a microwave are dangerous. Handled wrong at best you will get a severe shock and minor burns at worse its lethal. I know what is wrong with it and a qualified engineer might charge about 80 pounds to fix but my conscience wont allow me to tell you in case it goes badly wrong for you.
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.
The magnetron (the part that heats the food) may be ready to burn out. If you smell the burning, you should then unplug the microwave, open it up and see if you can determine for sure that it is coming from that part. Unfortunately even if I am right, it is almost more cost effective to just replace the microwave rather than replace that part. You can run this microwave till it dies if you want, but I would be ready with a new one.
if the magnetron is shot, then replace the microwave! the magnetron is what produces the 'microwaves' that do the heating. get rid of it! buy a new one! the smell is from overheating circuitry- don't want to take the chance of a fire! these days you can replace it pretty cheaply- with a fine piece of technology made in china! but, if it lasts 3-4 years, it's pretty cost effective. once again! if your getting a 'burning' smell from it, unplug it and dispose of it! good luck!
Is this oven still under warranty? If so, take advantage. If not, remove the power plug and the case. Short out, with a screwdriver, the large can-shaped capacitor with two terminals sticking out. Check the wiring and circuit board for signs of burning. If everything looks ok, remove the thin sheet metal wave guide that sits above or beside the microwave energy port into the cooking cavity. Under the sheet metal, there is a metal fan-like device called a 'stirrer' that has a plastic bearing. Remove this stirrer and smell the bearing. If it smells like the burning wire smell, replace the stirrer. You can buy it through 'Sears Parts' online.
A burning smell along with a different sound (growl) USUALLY indicates a breakdown in the High Voltage Side. This is not a direct short (short circuit) or the line fuse would have blown shutting everything down. The High Voltage Side is made up of-- The Secondary ,or High Voltage Side of The High Voltage Transformer, A High Voltage Diode, A High Voltage Capacitor, and The Magnetron. If The High Voltage Transformer is the problem it will smell like a florescent light ballast burning, and will smell each time you turn on the MW. A HV Diode burns and opens, thus no more smell. A HV Capacitor usually does not burn nor does the Magnetron. There is no Cheap-Fix unless you can see that the HV Diode is burned into and you can get to it to replace. CAUTION: Always unplug from power before attempting to repair. NOTE: If you replace a Diode make sure it goes back in the same direction it came out. Yes there is a front and back.
If you clean any appliances always plug out the unit power supply do spray any liquid in the unit that can enter inside the control, instead just wipe it with rug not spray. In this situation you have to call for a qualified technician. Maybe there are some wires that burned or rust in the control that cause the short circuit inside the unit..