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All microwave ovens have microswitches to confirm door open/closed. Many have several, and a bad switch can cause all sorts of strange issues. My ovens have 4 such switches, and I've had several go bad. You have to open the oven up to see which you need, measure them, and replace the bad ones. The good news is that the switches aren't expensive.
Then you have blown a fuse. Check inside the oven chamber and look for missing powder paint or signs of arcing, if so dispose of the microwave. If the inside is good remove all the screws and remove the cover. Replace the fuse. If the magnetron was making louder noises prior then replace the magnetron. Since the fuse went the giant capacitor is likely bad. While the cabinet is open make sure to look for burned wires, check the continuity of thermal cutoffs, and check the main circuit-board for burned traces or components. The relays in most electronics are known for arcing (spot welding) and staying in the wrong position. Tap them hard with the back end of a screwdriver. During all of this use safe electrical practices by having the power cord unplugged. The capacitor could still have a high charge on it so be careful.
Unless you are successful with a hard reset of the elctronics you are SOL and need to get a new control board. Check out the attached for parts Search Over 2 1 Million Appliance Parts
your door switch is mis-adjusted,furthermore the other safety switch on the door should have blown the power fuse in the unit,because by design for safety it produces a short circuit if door opens under operation,so if door was taken off and replaced it was not adjusted properly
Your model number prefix of 721 means it's made by LG / Goldstar.
F9 code on an LG means either a bad door switch or a loose door switch mount.
Even though a door switch clicks, it may still be bad inside.
This can be caused by slamming the door or by habitually opening the door while it's cooking without hitting the Stop pad first.
If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your full model number here: http://www3.sears.com (the 3 is correct)
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