Re: Gas Heater Issue, Saying lit
Two possibilities come to mind.
1. The flame sensor is dirty and not detecting the flame or the flame is not going all the way across the burners to the sensor. It would be on the opposite side of where the igniter is located.
2. If the furnace is a power vent unit and you have a small flue pipe going into and old large chimney, you may not be getting enough draft. You would need to add a chimney liner, the same size as the flue, all the way up and out the chimney. It generally happened with my furnace after we had it off for the night and tried to get get heat in the morning on cold days.
Be sure you live your life, because you are a long time dead.-Scottish Proverb