Hello I have a gas furnace made by Amana (GUIA/B/C/D Gas Fired Warm Air Furnance). When I turn my thermostat to auto and set the temp for the heat to come on it will not come on. The thermostat makes a clicking noise but no blower. I have replaced the rhermostat so that is not it. If I turn the switch from auto to on the blower comes on. On a very few occasions it works fine but they seem to get fewer and fewer. Any idea's? I would like to fix it myself if possible. Thanks MAC