Power Vents are notorious for locking out burners and it could be the fan prover switch.
The fan prover switch is activated when the power vent take out fan comes on. If the switch is faulty or the tube that goes from the fan to the prover switch is plugged up then the burner will not startup.
Most burner technicians will clean the tube that goes to the switch each time that the burner is tuned up.
Questions:
1. What is the make of your power vent? Tjernlund is the most popular one.
2. Did you press the reset button for your burner and if you did what happened?
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