Electrical Problems with Furnace - Wire Craft ElectricIf you find your furnace isn’t producing enough heat, or is just not even turning on at all, what do you do? You could call an electrician or a heating and air company, but fear not! There might be a quick fix available. Before doing anything, it’s best to check if the system even turns on. By turning your thermostat three-to-five degrees above your room temperature in the heat setting, you should hear it turn on within 10-30 seconds. If nothing happens, or you don’t feel much heat coming from the vent, it’s time to go down the list of potential causes.