I have a bryant 80plus. The blower does not come on when switched on at the thermostat. The glow ingitor was in pieces when this started. Now I get code 33.

Look on the back of the blower motor access door for the meaning of your code 33.

Does the circuitboard go bad and not allow fan or relay to kick on?

Look on the back of the blower motor access door for the meaning of your code 33. Post what it says