I have a 6 month old Minnie plus 26RBSS with a furnace issue. When given a call to heat the fan comes on and the furnace lights but immediately goes back out. It continually tries to light and I can here the flame start but goes right back out after a couple seconds. I’m thinking maybe a flame sensor. My calls to the dealer for warranty work was disappointing. If anyone has had a similar experience with their furnace please advise. If I can fix it myself I’ll do it before I fight with the dealer.
almost definitely sounds like a flame sensor.....I have not looked at mine but im sure you just have to take some steel wool and clean sensor. They also are not expensive, . If cleaning works ....replace sensor... 39 years Furnace guy, and Armstrong/Lennox dealer