The Potterton air pressure switch is a safety device which checks that the fan is fully operational. It ensures that if the fan in the boiler fails, there will be no build-up of toxic gases with no way of diverting them out of the property.
Fits a number of Potterton Appliances
Technical specification
TypeAir Pressure SwitchCompatible WithSuprima 80 LManufacturer Model No5105867Brand NamePotterton