If the furnace cycles up but the sensor fails to detect the flame’s heat, it shuts down the furnace to prevent gas from ...

Electric heating elements resemble those in ... In addition, gas furnaces feature a flame sensor that also shuts everything down if the burners don’t ignite when the gas comes on.

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

“When the air365 Hybrid system is in heating mode, a smart sensor monitors the outdoor temperature ... it automatically switches from the heat pump to the furnace.” Johnson Controls ...