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The 3 blink code means one of the pressure switches is not closing or opening back up. Check the items in chart below:
lest start with one at a time.Remove drain hoses and make sure no water is standing in hoses and that main drain is clear.
Excellent, Next lets check the vent to make sure it has absolutely no restrcitions .Even a spider web or dirt dauber can restrict. Remove hose from inducer housing and clean it out as well as using a straightened paper clip or similar to clean fittings on switch and inducer housing
Let me know and we can go from here. Also you may want to remove inducer housing and make sure no water, insect or anything in there and little blower wheel in tact.
Does the little vent inducer motor actually come on?
OK either one of two things, there is a loss of vacuum such as gasket leaking where inducer mounts to furnace or pressure switch is defective. You would need a vacuum gauge to verify vacuum being pulled on switch to verify.
I was hoping it would be something simple, but that would be our next step in troubleshooting is to check the vacuum before we just start changing parts.
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Thanks again I will post rating starts for you to rate.