Vaillant ecotec F22 fault code

The Vaillant F22 fault code typically presents itself when the printed circuit board deems that there is not sufficient pressure in the system to operate safely.

If you look in the Vaillant installation manual it states the following; “No or to low water pressure in the boiler, water pressure sensor defective, cable to pump or water pressure sensor loose/not connected/defective”

Often a homeowner can fix this fault themselves and get an appliance to work by adding pressure to the system via the filling loop. Sometimes the filling loop is integral to the boiler an is fitted underneath the boiler. Otherwise the loop is often fitted externally on the pipework somewhere.

Pressure can be added to the system by opening the two “keys” or taps at the same time until there is “sufficient” pressure in the boiler. By sufficient pressure I mean typically around 1.2 bar.

The ecoTEC range of boilers use a pressure sensor to determine if there is enough pressure in the system. If this sensor becomes defective or blocked then the F22 fault code may still show even though there may be enough pressure in the system. In this case you would have to call someone competent and Gas Safe Registered to investigate the problem.

If you keep experiencing the F22 fault and have to keep adding pressure to the system periodically, or every time you put the central heating on, then this is indicative that your system is losing pressure for some reason and someone competent should be called to have a closer look. The boiler may just need to be serviced to fix this problem.

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Areas where I can repair your Vaillant ecotec F.22 fault

areas that are covered

I am located in Elsecar, Barnsley, South Yorkshire. I cover a large part of South Yorkshire including most of Sheffield, Rotherham and Barnsley. I also cover a small part of Doncaster.


I cover most of Sheffield including central Sheffield, Chapeltown, Ecclesfield, Grenoside, High Green, Oughtibridge, Thurgoland, Wortley, Aston, Aughton, Swallownest, Todwick, Hillsborough and Stannington.


I cover the whole area of Rotherham including central Rotherham, Brinsworth, Catcliffe, Canklow, Masbrough, Treeton, Whiston, Greasbrough, Kimberworth, Thorpe Hesley, Rawmarsh, Wentworth, Bolton-on-Dearne, Goldthorpe, Thurnscoe, Wath-on-Dearne, Mexborough, Swinton, Kilnhurst, Hooton Roberts, Ravenfield, Thrybergh, Bramley, Hellaby, Maltby, Thurcroft, Wickersley and Braithwell.


I cover most of Barnsley including central Barnsley, Birdwell, Stairfoot, Worsborough, Kendray, Ardsley, Athersley, Monk Bretton, Lundwood, Royston, Brierley, Cudworth, Cortonwood, Great Houghton, Shafton, South Hiendley, Brampton, Darfield, Wombwell, Hemingfield, Elsecar, Hoyland, Jump, Barugh Green, Cawthorne, Darton, Dodworth, Gawber, Mapplewell, Pogmoor, Staincross, Wilthorpe, Worsbrough, Thurnscoe and Tankersley.


I cover a small part of Doncaster including central Adwick, Conisborough, Edlington, Warmsworth and Mexborough.