The Potterton air pressure switch enacts safety checks which ensure the fan is fully functional. It ensures that, if the fan fails within the boiler, there will not be a build up of noxious 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 instruments.
Fits a number of potterton appliances
Technical specification
TypeFlow SwitchManufacturer Model No10/18753Brand NamePotterton