Unvented gas logs Problem
My son called me and said his gas logs were smoking the painted celing. He stated that nearly all the celing rafters in his living room, were shadowed with discoloration. He said there was black discoloration on the central unit filters. There is no sign of visible smoke or smell. He has used the logs for about 6 years. I told him to make sure flame was not touching the logs. He said he checked and it was ok.
That's about the only thing I can think of, what could be other causes?