Inside is starting to spark while running more than 45 seconds.

It might be the appliance isn't properly grounded or it might be it is faulty or it might be there is something inside that is unsuitable.

Microwave ovens should not be operated with nothing inside and only suitable containers should be used to hold food for heating. Cups or plates with gold painted rims and metal containers and those containing metal are likely to cause a veritable electrical storm inside.

Thank you for your inquiry, friend!
I see you would like to run your Frigidaire microwave for 90 seconds. Typically, you would push the "9" and "0" buttons then the start button to start your microwave for 90 seconds. If these steps do not help with programming could you please provide me with your model number? You can locate your serial tag (which lists your model number) on the inside wall of your microwave. I hope this information is helpful to some degree. -Matt

CHECK THAT THERE IS ON FOLE INSIDE OF IT OR THAT THE PAINT HAS NOTCOME OFF THE DOOR.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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Is it a programmable oven? check to reset all programming (according to the manual) and for the safe side it is not dangerous for you or any other person but if nothing is in the oven at the time it starts, it could dammage the MAGNETRON UNIT, meanwhile you could keap a glass of water in it when it is not used, by the time you fix it, if it starts on it's own at leas you wont dammage the magnetron.

Good luck!

Is it an electrical spark noise or is it actually sparking inside your microwave oven? Watch as you heat something. This also might appear to be the bulb flickering, when it's actually a sparking. I only know how to fix it if it's an actual spark, or what might be called "arcing." This is not supposed to happen.

Inside your microwave, there is a "cover" over the area where your bulb is. If this cover has a burned place in it, or an actual hole in it, then it's your "waveguide cover." And this is the easiest thing to repair. I myself will not attempt any electrical repair, but this waveguide cover was a breeze.

You have to purchase replacement material... Then, when the replacement material arrives, remove the wave guide cover from your microwave, trace it, cut it out and put the new one in. It is very easy to fix. Sort of like paper dolls....

Google "waveguide cover" and you're on your way! IF that's the problem....

If unit was run for long time with food on walls and not cleaned off, it is possible that the unit was burned in a spot where the food was and if there is metal frame under that part for the finish it will spark. Check closely for burns, if it is sparking due to that problem, junk it. It is a dangerous condition.

check halogen light holder and connections, and any damage body, check inside body of microwave oven , because of microwaves some sparks comes from damaged body..