With summer just about over and the arrival of fall around the corner, you need to be sure your furnace is in working order. When the furnace switches on, you may find that it only runs for a few seconds before shutting off. One possible cause may be a dirty furnace flame sensor.
What Is a Furnace Flame Sensor?
The flame sensor is a thin metallic rod located on the burner assembly and in front of the pilot flame. The furnace flame sensor determines whether a flame is present when the gas is on. Without the sensor, the pilot light could go out, and the furnace could emit harmful gas.
The sensor acts as a safety device. When it detects that the flame isn’t on, it shuts down the entire unit to prevent dangerous gas emissions.
Signs of a Dirty Flame Sensor
The flame sensor can become corroded due to carbon buildup from the flame. This can cause the sensor to fail. If the burner light goes out within seconds of switching on the unit, this is a telltale sign of a dirty sensor. If you see soot clearly covering the sensor, then it’s time for a cleaning. Continue Reading →