I have a lennox gas furnace.
the led light flashes 4 times telling me that the hi- limit not working properly. but if i beat the furnace, it will submit and kick on.

does anyone have experience with this?
is it likely the limit? or a board or wire?
also, i did pull the fan out and visually look at the limits that were there... not sure which one is hi limit etc... is there an online manual some where?
thanks
herm