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The 31 error code is going to be a pressure switch error. Does the small vent motor come on when you call for heat?
When you say it runs about a minute. Can you tell what is running? Does vent motor come on? Do burners light Does main blower run?
OK on call for heat the first thing that has to happen is that small vent motor (wheel) has to come on and pull a vacuum on pressure switch to close it.If it does not come on, the switch does not close and main blower comes on and sends the 31 error code letting us know presssure switch did not close. Do yu have a volt meter to see if the small vent motor is getting voltage on call for heat?
It is possible even though new that either the inducer vent motor is bad or board is not sending signal to inducer. WE would need a meter to determine if so.My recommendation is to call installing contractor as they should fix at no charge if installed within last year.
THanks for letting me work with you. Often we do find something simple like a rollout needing reset or something ,but often requires detailed troubleshooting.