Hi I have an old g12 its always worked well but recently it has had trouble (intermittent) firing up. Seems like most of the time It will flame up but it sounds like the fan is trying to come on but it can't quite make it. If I tap the anticipater(?) with a screwdriver a few times it will come on but after a couple of cycles it does it again. I Believe I replaced that part once already... maybe 5 years ago. Any Ideas? Thanks, Greg