If the sensor cannot detect a flame, it will shut down the furnace to prevent unburned gas from escaping. Residue buildup can stop the flame sensor from operating correctly. Cleaning it can allow ...

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

a cloud of unignited gas can accumulate. 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 ...

With temperatures forecast to drop to near zero degrees, some simple steps can prevent burst pipes, a furnace breakdown and high energy bills.