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The 14 code means "ignition lockout". This can be caused by a number of things: dirty flame sensor, burners not lighting (due to a bad ignitor), burners lighting, but not smoothly and quickly all the way across. poor ground from burner area to board, and finally a bad board.
If burners are not lighting smoothly all the way across, this can be caused by dirty burners, misaligned crossovers (the slots in burners that spread flame from one burner to the next). A weak ignitor can cause delayed ignition, so you may want to try the new ignitor. Make sure the flame sensor wire is good. You can have a new flame sensor, but if the wire that attaches it to the board is bad, the new flame sensor will do no good. A ground wire can be added from a GND terminal on the board to the burner area sometimes depending on whether burner area is enclosed. Finally, sometimes everything can be OK, but board is bad thereby not sensing the flame. I would try everything else first before replacing board.
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