I have a Sharp Carousel microwave model R438DV 1200 watts. There is a small 5x7 screen on the right side wall. It now has a small hole and has char marks on it. When I use the unit a fire starts o

faulty microwave module replace it

Possibly a bad door switch behind the holes where the latch hooks go into. Usually with the bad switch the timer counts down but nothing runs. It all depends on which switch is bad. Usually 3 switches inside.

They is one of the DOOR SWITCH need to replace

clean off the bad spot sand use tan/white enamel paint... it's o.k. no lead in usa paint just wait till dry before using

There are door switches and one of them is evidently out of adjustment or the little actuator arm on it is.

you must carefully and read your instr. manual if some material inside the microwave can be produce fire. Otherwise the microwave can be old and the electronic component deterioring and cause exploding.Some time the material inside from the microwaves, is corroded, and the irradiation can be produce Fire. Tes the indication given.

God bless you

This is not good, the magnetron is arcing because metal is exposed, this will eventually destroy the magnetron making the oven useless. I strongly suggest it get looked at for safety and potential fire hazard.

Hi,
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Microwave Oven Basic Troubleshooting Tips

heatman101 -==-
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i just checked my R-3A36 manual to find out the wattage. it's 800 watts. i make pralines in my microwave. i am always asked for the recipe. so i needed to be able to tell people the wattage of my oven so they can adjust the recipe to their oven.
garry, metairie,la.

I do not know how to specifically replace the "inverter board" in this model. On most microwaves I've repaired, though, the hardest part is getting them dismounted from the wall if they are rangehood models. I suspect that the inverter board is held onto the chassis with two phillips screws, and all the connections thereto are modular and therefore easily disconnectable and swapped out. The great majority of times, manuafactureres do NOT put multiple connectors of the same pin count and oriention on a circuit board. Give it a go.