This part is located within the air pressure switch section. The air pressure switch is a safety mechanism which always ensures the fan is in full working order. It ensures that, if the fan ceases to function within the boiler, there would not be a build up of dangerous gasses with no means of extracting them safely. The printed circuit board monitors the air pressure switch to make sure it is fully operational, it will stop the appliance firing up if this key feature isn't functioning.
Fits multiple appliances
Technical specification
Waist Sizeac89ch13guTypePipeToilet Cistern CapacityFTW--Supplier Part Number78753Brand NameIdeal