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Turn power off to furnace and thermostat off. Then power back on and tell me if you still have error code.If not call for heat and see how far in sequence it goes.
The normal sequence of operation:
Inducer vent motor comes on
Pressure switch closes
Main circulating blower comes on
If furnaces fails anywhere in the sequence we should get an error code by blinking lights on the control board. Turn power off and back on, then call for heat.tell me how far in that sequence it goes and what error code is on first failure We will go from here.
We will go from here.
Sounding like maybe a bad board if it is igniting but board says no ignition.
Let me know how it goes.