Not operating for more than 15 second then error f11 err on display with beeping sound

That error means the keypad control has a shorted key. The only thing you can do is try and reset the electronics by killing power to it at the breaker/fuse panel on your home for one full minute then restore power. If after that the problem persists the keypad panel will have to be replaced. The problem with that is they are no longer being manufactured so you won't find a new one. The part number is 318271528. I did find a used on Ebay for a half decent price and they say it's in good working condition so you may want to jump on that. I linked you to it below.

https://www.ebay.com/itm/185017846271?hash=item2b13ec49ff:g:d2YAAOSw9WhhJ7GC