Enviro Maxx-1

Try cleaning the POF snap disc and the area around where it mounts.

slug-go said:

Yea I'm green working on stove but learning. POF. proof of fire and is that the ceramic fan temp sensor with wires coming out of it with 2 screws. If so I can take that out and clean. That's next to the combustion blower correct.

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That is it!
I like to replace those Enviro mini snaps with a full size snap disc . Like those compact spare tires on a car!

They can be stuck with crud
gently pry up with screw driver alternating
between ends where screws attach this
rocking motion should pop out.

I had this exact same problem with my Maxx a couple of years ago, I thought it was the circuit board too and had it replaced (under warranty). Problem came back the following year (maybe 25% of the time upon startup, convection fan would not turn on after startup cycle - no flashing #3 or anything like that).

I fixed this issue by removing the POF sensor as well and cleaning the crud off of it, like was posted earlier - I haven't had this problem since. There was some built up carbon on it, not a lot - but I guess enough to insulate that sensor. Once I removed the two screws, I used a razor blade to gently get inbetween the sensor and the combustion housing which it is attached too - it came of easily. It was stuck on there with some red (rtv?) liquid gasket material from the factory or something. I make it a habit now of removing this sensor at the end of the season and cleaning it off, I put it back on with the same sealant I use on my exhaust piping. Hope this helps