Your furnace is a lifeline during the chillier months, but the extra strain winter weather puts on your HVAC system could ...

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 ...

where the furnace had shut down and the temperature was already down to 59 degrees despite two space heaters running. Stephens found a clogged sensor that he was able to quickly fix. "The flame ...