i have a 4 yr old gas furnace. The problem i have is that the thermostat shows the heat is on ,but the furnace is not . So what i have to do to get it going again is to reset the breaker. And then the furnace is fine for a couple of days. And it starts over again. Not sure if its my thermostat or furnace.
remove the sdtat off the subbase and jump R to W see if you get a complete control with the jump if it doesn't come on with the jump it's something within the furnace..especially with that resetting your doing with the stat mounted..