Self cleaning feature won't work

Greetings,
We have a FEF378CESA frigidaire that no longer
self cleans - there is a locking feature ( electric )
I think that does not engage. Also the oven now takes
longer to heat up than usual. I’m also having trouble with
this forum page layout - it won’t let me scroll down there is
no scroll bar to the right ?
I hope this posts - if it does would
some one be kind enough to let me know @
morganp@ntplx.net

Thanks in advance !