A burning smell and sparks occurred in my Whirlpool MT1100SHQ-1 microwave oven yesterday, and I now have a rather large (quarter-sized) burnt area in the metal. The metal is flaking off, possibly all the way through the metal plate. There is also soot on the top of the microwave above the burned area. Is it safe to continue to use the microwave as it is? Is it possible to fix/replace the plate, or is that unsafe?
Re: burnt hole in metal plate inside microwave oven
Ok stop useing oven and unplug! THIS CAN BE FIXED!!! Go to a home improvment store and buy a small bottle of white liquid enamal....Clean up the area that is missing and flakeing and then apply the enamel over the hole and let dry overnight! now that the exposed metal is covered back up it is safe to use and will not spark or cause any more soot!
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There is not any power in the door itself. However if the chassis has chipped paint or corrosion the RF from the microwaves magnetron will cause those bare metal areas to reflect the concentrated RF energy and cause sparking.
The only Whirlpool Microwaves that have been recalled, has a model number beginning with XC and had a green sticker on the bottom face area of the chassis where the door closed.
I have often been able to clean and paint the bare metal areas with the correct paint to stop the RF reflection sparks. Using the model number above it is white enamel "appliance paint" that you would use to paint the bare metal areas. A word to the wise.... do not sand outside the area to be painted. Otherwise you re-introduce your current problem post repair.
The model number you passed is missing the very last digit that would be from 0 to 7 (Eight models)
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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This can be caused by grease etc. inside
the oven and on the wave guide which is the paper like thing in the oven. If
you can remove it look for burnt areas which may can be scraped off or you may
need to replace it. An appliance parts store usually has the material you can
cut to fit you own.
It is very possible it may have burnt wire or burnt capacitor. Remove unit, remove top cover and look inside to see if you see any burn marks or burnt wires. Also check fuse to see if it is good or not.
If it is burning and arcing at the antenna, it is probably arcing in the wave guide area. Probably will have to replace unit. I have had some success by removing the antenna, sanding and repainting the burnt areas of the cavity and sanding off any burnt marks on the antenna. Need to look at top of mag to see if also arcing there too.
water may have leaked inside unit causing a short.the transformer output is about 1400 volts that feeds a large capacitor. a direct short can blow the transformer instantly or any support parts without time to burn something. creating little or no smell. I never sujest that a person
to try to repair a microwave oven because
the capacitor can still be charged and very lethal.
be very careful cos microwaves can kill - there is very high voltage present even when disconnected from mains. unplug from mains & leave for 1 hour. remove cabinet. there is a fuse which controls everything usually located near the transformer or where the mains cable enters. check fuse and replace. it needs to be the correct fuse for the appliance