Your furnace is probably a more recent model. Learn how to clean a furnace ignitor here. The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting.

As to how to fix it, Simon Bernath, the founder of FurnacePrices.ca, explains to House Digest, "It is possible to try to clean ... The Sensor, Your Furnace May Not Work Properly The flame sensor ...

PITTSBURGH, March 4, 2025 /PRNewswire/ -- "I thought there could be an improved way to clean furnace temperature sensors and ignitors," said an inventor, from Albuquerque, N.M., "so I invented ...