The Potterton air pressure switch is a safety device which checks that the fan is fully operational. It ensures that if the fan within the boiler fails, there will be no build-up of toxic fumes with no way to divert them out of the property.
Fits a number of Potterton appliances
Technical specification
Waist Sizeaa45ce11fwTypeAir Pressure SwitchCompatible WithSuprima 100 L, Suprima 30 L, Suprima 60 L and Suprima 70 LSupplier Part Number5105574Brand NamePotterton