you may wish to clean the ignition sensor (aka flame sensor) on your furnace. The ignition sensor is a safety device that ...

If your gas furnace begins to blow cold air, then cuts off abruptly, it could also be the flame sensor, which sits in the ...

The sensor allows the pilot light to be automatically re-ignited if the flame is no longer present. The circuit is a surprisingly simple one, with a PNP transistor being turned on by the flame ...