JanetAfterAll writes:
Hello!

I know other people have asked this question on this forum, but I don't see the answer to my particular situation; forgive me if I missed it.

..
I turned the gas valve in the fireplace from parallel to perpendicular.

In general, a gas valve is open when it is parallel (i.e. in-line with
the gas pipe) and closed when it is perpendicular.