What's the matter if the burner can't ignite smoothly, or makes an abnormal sound at the moment of ignition?

What's the matter if the burner can't ignite smoothly, or makes an abnormal sound at the moment of ignition?

(1) The damper is too large, or the gas volume output by the solenoid valve is too small;

(2) The position of the ignition electrode is incorrect, or the dirt accumulated near the ignition electrode affects the ignition arc;

(3) The internal pressure of the furnace itself is too high;

(4) The caliber of the exhaust pipe is too small or there are too many turns;

(5) The gas pressure is too high.