When I on the Microwave or Toster oven, I get a noise crackling sound
out of the GFCI switch outlet, with a smoky smell.
Request to confirm, what is the probable problem and potentail
solution to resolve the same.
Sure, look, but as long as you have it apart, change the GFCI anyway.
They're cheaper than a fire, and if if has already made funny noises and
released some of the magic smoke that all electrical devices contain, it
is probably damaged anyway. Stuff that can kill you is not the place to
try and save ten bucks.
<<<should one replace by 15 amps or 20 amps switch>>>
15 0r 20 amp GFCI *Outlet* depends on size of wire going to (feeding) it.
#14 gets 15 Amp
#12 gets 20 Amp.
Most likely is already a 20 Amp with #12 wire feeding it.
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