The burner starts normally, but the operation is interrupted during the "blowing program" and the control box lights up the fault light. What's the matter?

Possible reasons:

(a) The control box may be faulty (damaged)

(b) The air pressure switch does not act, the air pressure switch is damaged, and the contact of the gas burner cannot act when the air pressure reaches the set value. The air pressure port or piezometer is blocked. Check whether the set value of the air pressure switch is set correctly, and the fan failure causes the air pressure to be too low.