The Ferroli air pressure switch acts as a safety mechanism that ensures the fan is fully functional. It ensures that, if the fan fails within the boiler, there will not be a build up of toxic gases with no means of venting them. The PCB closely monitors the air pressure switch to make sure it is fully operational before the unit is fired up, preventing the appliance from starting without one of its key safety mechanisms.
Fits a number of Ferroli boilers
Technical specification
TypePressure SwitchManufacturer Model No39805631Brand NameFerroli