Old Furnace Flame Sensor

Furnace not working flame sensor troubleshooting.

Old furnace flame sensor. There is nothing wrong with it but i just want to buy a spare and have it ready to go in case the flame sensor starts causing issues as they seem to do that every few years. Steel wool for cleaning flame sensor. Https amzn to 2dlocjt if your furnace burners light and stay lit for a few seconds and then shut off you most likely. Between the 1st and 2nd burner ports from left to right you can see the wire leading to the flame sensor the sensor is easily accessible and typically mounted by one 1 4 hex head screw.

As long as the component senses the flame it sends a message to the main furnace control board telling it to keep the main burner on and the gas valve open. On this one i can t even tell where anything is. Lennox gas furnaces contain an important safety component known as a flame sensor. Upon removing this screw the sensor will slide out so that you can easily clean it.

In the video you can see 4 burner ports. This video is packed with just about all the information about flame sensor testing operation troublesh.