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Hello click here for the manual
see page 66, error code 226 = high pressure switch failed closed, see trouble shooting instructions in the box to the right of code 2226
typically these error codes are meant to assist trained Lennox technicians, not as advice to a home owner.
Tell me a lot about your technical skill sets, or if none of this is in your bag of skills, tell me which direction you are from the center of the nearest town or city and I will see if I can find a well rated Lennox technician for you
Its time to rate my work so far, so that we can close the question out, thanks