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Allow fan to run 90 seconds and let me know if this error code goes away.Then call for heat at thermostat and see if furnace will work or if it gives us a different code..WE will go from here.
What error do you get when it stops before you reset power?
Not sure where you are getting info from but the 12 error code does not indicate an igniter issue.
The one two will occur anytime power is turned off and back on to furnace.This will flash for 90 seconds and blower will run.After 90 seconds, blower should stop and error change to continuous on.
The 34 you are getting now indicates possibly a dirty flame sensor. See diagnostic chart here:
Lets start by cleaning your flame sensor and see if that solves the problem. Below is a ink to a generic video explain how to clean the flame sensor.
TRy cleaning the flame sensor.Do not touch the hot surface igniter as it will break,Flame sensor is in front of farthest burner from igniter,
The 12 is normal after power up. The 14 and 34 both still indicate board is not sensing flame.If you had water in furnace it is very possible board itself has got wet and will have to be replaced. My next step would be to get a meter and determine if the board is getting at least 2 micro amps from flame sensor.If so replace board.Below is a video showing how to test this.