WST3507SS ACCDENTALLY ENTERED FOIL, CAUGHT IN 5 TO 7 SEC. ARCED AGAINST DOOR MELTED NICKEL SIZE SPOT ON INSIDE SURFACE
STILL WORKS. NOW GETS STEAM IN BETWEEN DOOR GLASS. IS IT DANGEROUS? SHOULD IT BE REPLACED?
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Maybe. The presence of metallic material (foil, stainless steel silverware, etc.) in an operating microwave oven creates electric arcs between the foil and the inside wall of the oven. And this can destroy the electric components.
Scratches, flaking and bare spots are fairly common, but should be addressed as
soon as they arise so the corrosion will not spread and arcing does not
Unplug the power cord first.
Take some mild sanding cloth or scotchbright and clean
the bare and rusted areas in the microwave.
Use appliance touch up paint to re-coat the surface. You can find the
touch up at most anywhere that sells appliances,
it comes in a plastic bottle similar in appearance to fingernail polish,
yes it does have a brush inside.
Let it dry per the instructions
on the bottle or 24 hours if not specified.
You first want to be sure your hood vent exhaust fan is working properly, that your grease filters are not clogged, that your charcoal filter (if equipped) is being changed every 6 months or whatever the owner's manual recommends, and that your exhaust duct work and outlet are not blocked.
You can also download the installation instructions from the link above and they will help you in checking the ducts and outlet.
If they're all okay, to prevent future moisture buildup, I recommend wiping the condensation off the walls and inner door surfaces after cooking, and leaving the door open a while to help it dry out further.
Plus I always recommend that you use the hood exhaust vent fan whenever you're cooking on the stove top to keep heat, steam, and
grease out of the controls and the door panels.
Once troubleshooting and prevention are covered, then you can clean and repair the inner door surfaces.
You have to separate the door panels (as shown in the attached photo)
and then you'll see the previously hidden screw(s) you need to remove.
Or you can watch a YouTube video (not a video I
made) that demonstrates how it's done.
You can also find
helpful exploded view diagrams and order parts by entering your full
model number here.
If the rust is bad, the area will first have to be sanded smooth and
cleaned and dried thoroughly.
Then you can apply some
high-temperature appliance paint, available from places like Wal-Mart,
Lowe's or Builder's Square.
If the wire mesh screen is damaged beyond just surface rust, it will have to be replaced, as it prevents microwave leakage, which can result in arcing or a fire.
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
Sometimes the arcing itself will cause black marks inside the oven. The places where the foil was melted, (touching), likely left small metal deposits, possibly now, impregnated in the surface. It is important to remove these if possible to avoid further arcing. Remove these then test to make sure the oven is functioning properly. If so, continue to use.
check the conductivity of the plastic with an ohmmeter by placing the probes an inch apart on the plastic surface. If the resistance is large or infinity, the plastic probably performs no role in stopping the microwave radiation. If so, any epoxy probably can be used to close the hole safely. Make sure you don't use too much and if possible place tape over the repair and orient the microwave so the epoxy presses against the tape while drying to prevent it from oozing into any door hinge/close mechanism. Otherwise, a piece of microwave door glass from a broken unit can ge glued over the hole and should stop the radiation. You can check for leakage with test units but be very carefuly anyway.