• Your thermostat tells the furnace to provide your home with warm air. First, the carbon monoxide fan begins, then the furnace circuit board receives a signal from a switch that indicates to continue starting your furnace. The heating sequence takes a little time because several saftey switches are being used along with each furnace heat… Read more

  • Your furnace has several carbon monoxide safety switches that cause the heating to stop working. If the furnace door is off the unit, then this could be a reason the heating wont run. A bad fan or rusted inducer draft motor will let the furnace circuit board know that carbon monoxide will not be removed… Read more