[2 DA WDS]

OK, the furnace actually lights and produces heat when it starts but it shuts down before it reaches the temp set by the thermostat. Then, it stays off for 2 or 3 minutes then starts, lights, produces heat and shuts off again. It keeps doing this until it does reach the temp set on the thermostat. Last fall I took it to a dealer because it would never stay lit and they said it worked fine for them. I told them to check the propane regulator and they said that it was bad and replaced it. Now I am having this problem.