Vaillant boiler manual f75

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Boiler showing F75. Pressure sensor was previously replaced a few months prior. No rise in pressure when there is a heating or hot water demand. We checked the The boiler manual lists the following potential causes of the Vaillant F75 fault: Water pressure sensor and/or pump defective, air in heating installation, too then lists a number of possible causes;. “Water pressure sensor and/or pump defective, air in heating installation, too low water pressure in boiler; check ? If possible, close the gas isolator cock on the product. Page 4. 1 Safety. 4. Installation and maintenance instructions ecoTEC plusHaving siad that nothing is perfect and while I would include this sensor (the f75 water differential sensor) in the design as it prevents the boiler firing