Product Information: The air pressure switch facilitates safety protocols which check the fan is fully functional. It ensures that, if the fan fails within the boiler, there would not be a build up of toxic gasses with no means of venting them. The PCB closely monitors the air pressure switch to make sure it is in full working order before the unit is fired up, preventing the appliance from starting without one of its key safety mechanisms.

This part is present in 8 different boilers in the Alpha range including the Alpha 240 P , 240 E , 240 X , 280 P , 280 E .