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

This part is present in 17 different boilers in the Biasi range including the Biasi 20SE , PRISMA 28SE , 24S 24S , 28S , PRISMA 24SER .