The microwave model is Kenmore 721.62464201. It's arcing.

The model number 721.80032 is a partial model number; it indicates the build series. I found the Kenmore microwave, 721.80032700. The final 3 digits indicate the panel color and similar details.

Assuming the microwave was installed properly, it should work as a hood fan. Press the touch pad with the fan icon (underneath it says Hi/Low/Off) to get the desired fan speed. The icon is on the lower left of the control panel; it's below the Cook Time button and to the left of the Light button.

The manual for the 721.80032700 is available here: https://www.searspartsdirect.com/partsdirect/user-manuals/72180032700-kenmore-parts-manual?manualIndex=0 . The direct link to the Owner's Manual is https://c.searspartsdirect.com/mmh/pd_download/lis_pdf/OWNM/L0710653.pdf . See pages 9 and 14 for using the exhaust fan.

I hope this helps.

Cindy Wells

Arcing Inside the Microwave - Martin Microwave Inc.

microwaveglasstrays.com/shop/articles-arcing.html

Microwave Glass Trays, : Arcing Inside the Microwave - Microwave Glass Trays ...glass tray, microwave plate, glass trays, turntable, microwave oven, carousel, ...microwave energy, and will eventually it will start producing arcs and put out one heck... the damage is non-repairable and the unit should no longer be operated.

Notes on the Troubleshooting and Repair of Microwave Ovens

www.repairfaq.org/REPAIR/F_micfaq3.html

Microwave oven does not respond to START button. First ..... but with the leakage from the spot welded waveguide inside the unit. ... My clue in was a spark between the waveguide and the case, when I was messing with the Controller PCB.) ...

MICROWAVE OVEN ARCING ' MICROWAVE OVENS

It may be the oil in the popcorn---do you own one of the covers that go inside to cover so food does not splatter?

This is caused by either carbon arcing from carbonated food deposits or metal dish or bowl being used inside the machine causing a track. Even a recycled paper towel can cause it as the towels have metal traces in them.

These units are powder coated, it's an involved process grab a new one soon. That arcing can lead to bigger problems!!!

The area will first have to be sanded smooth and cleaned and dried thoroughly.

If the cavity metal of the oven is cracked or split, you can use a small amount of steel-based epoxy such as JB-WELD to patch the crack or hole.

Once that dries thoroughly, you can sand it very smooth.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Look in cavity for any burn marks. If burn marks are present sand and paint area. You have to use paint made for microwaves. If no burn marks, Flash coming from magnetron and it would be time to replace. Yes it can be a safety concern, I would not use until fixed.

Depends on the door. It likely can be adjusted they have 2 screws on the door bracket you may have to remove the cover to see them. But it also needs to be checked with a leakage meter to make sure its not leaking.

RadioShack used to make a low cost meter not certified or anything but a good way to see if its leaking.

Your problem is due to the "magnetron" arcing to the wave guide within the microwave. Picture someone arc-welding stuff together inside the microwave casing, that's essentially what's happening. It is a fire hazard and you should stop using the microwave immediately. As far as I know, there isn't a recall on that particular model (though there was on another similar Kenmore/Whirlpool model) so if it's out of warranty, you're out of luck.

It is child lock and you can unlock it by press and hold the start button.