Lennox 17J56 Flame Sensor

The Lennox 17J56 Flame Sensor is a crucial safety component in Lennox gas-fired HVAC systems. It safeguards the system by detecting the presence of a flame within the burner assembly. The sensor functions by sensing the heat radiating from the flame. This detection triggers a signal sent to the control board, guaranteeing safe and continuous heating operation. Designed to withstand high temperatures ranging from 1000°F to 2200°F, the sensor is compact, typically between 3 and 5 inches long and 0.02 to 0.05 inches thin, allowing for easy installation within the burner compartment.