Hit the start button and runs for 6 sec then code F-9 can't find manual

TCP is "True Cook Plus" in Kenmore speak.
Here is a cut/paste of a section of the manual.

*CUSTOMIZING TrueCookPlus' You may find that you prefer TrueCookPlus® to cook your food more or less. TrueCookPlus " can adjust to your tastes - to cook your food hotter or cooler - automatically: Example Clear 1. Press the Clear button. (§H§ 1 2. Press the TrueCookPlus® button twice. 3. If you want less cooking time when you enter a TrueCookPlus code, press 1. This will decrease the time by 6%. 345 4. If you want more cooking time when you enter a TrueCookPlus® code: Press 3 for 3% more cooking time. Press 4 for 6% more cooking time. Press 5 for 9% more cooking time. 2 5. Press 2 to reset TrueCookPlus* to factory setting default time. 6. Press the Start button.
I didn't try to clean up the copy
Hope this makes sense and helps.

Have your tried pulling the electrical cord out of the wall?

I Believe this model has an options button with codes by numbers which are 1 thru 6 I believe. Either 1 or 2 are sound. So hit the options button and hit the number 1 it should say (sound), Then you will hit 1 again a.k.a. mute, and no more beep beep beep. If 1 is not sound then you may have accidently created a small but deadly emp, so hit stop and you must hit options and then hit 2.

mcdevito75 here, Sounds like the timer mechanism which is most likely transistor board is wet or shorted, see any appliance repair shop in your area for help.Or Check the owners manual for repairs.

All electronics work but microwave won't heat.

Fuse may be blown on the inside.

The owner's manual is here. On page 10 we find:

COOKING IN ONE STAGE
1. Press the POWER button; the Microwave and High
Cook indicators will light and “PL 10” will light in the
display.
2. Press the POWER button different times to set the
desired power; the display will show the percentage
you chose. If selecting power level 70%-10%, the
Low Cook indicator will light instead of the High
Cook indicator.
3. Press number keys to set the desired cooking time.
OPERATION(CONTINUED)
4. Press the START/+30SEC. button to start cooking;
the Microwave and one of the Cook indicators will
blink and the display will countdown the remaining
cooking time in minutes and seconds. It will beep
five times when cooking is completed.

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

It seems there is something wrong either with the builtin controls or the buttons. It needs to be examine by a professional.

The F-9 code indicates a problem with either the magnetron or inverter.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

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

On some models hitting popcorn will make the microwave come on for like 2-1/2 Min's.....then shut off....Maybe yours is like that...It's also on high power