D.N.
I had this problem years ago. It is probably the thermal couple (sp?) that ignites the stove. You would not smell gas. This can also happen to a hot water tank or boiler/furnace. It will cost you about $150 or so, plus about an hour of labor time. Mine was about 7 years ago and cost $128. I also had a 90 day warranty from the repair company. If you are quoted more than $200, you might want to consider a new stove. I also suggest checking the better business bureau for a rating.