Potterton air pressure switch is a safety device which checks that the fan is fully operational. 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.
Fits a number of Potterton appliances
Technical specification
TypeAir Pressure SwitchCompatible WithSuprima 100, Suprima 30, Suprima 40, Suprima 50 and Suprima 60Manufacturer Model No642236Brand NamePotterton