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Turn power off to reset board. The turn power back on. Let me know if you get an error code immediately and if so, what the code is the very first time furnace attempts to light.
OK if you are getting inducer come on with no call for heat issue is going to be an open limit or defective board.
However we should get an open limit code on first attempt.I would start by just making 100 per cent sure the limits are closed and if so replace board.
I am showing Lennox part number to be 33J6201
The upgraded board shows to be a Part Number:19W94
See link below and verify that is the correct board: