The Baxi air pressure switch enacts safety protocols that ensure the fan is in full working order. It ensures that, if the fan fails within the boiler, no toxic vapours will accumulate here without a way to vent them. The Printed Circuit Board (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 instruments.

Brand Name	Baxi