The air pressure switch acts as a safety instrument which ensures the fan is fully operational. It ensures that, if the fan fails within the boiler, there would 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 completely operational before the unit is fired up, preventing the appliance from starting without one of its key safety mechanisms.
Supplier Part Number: 87161461590
This part fits Worcester 28I NG FSN COMBI
Manufacturer Model No
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