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Thanks John, the F22 flashes on and off with pressure displayed in between. Sometimes it is 0.7, sometimes 0.4 sometimes 0.0. Other times instead of F.22 I get the image of a flashing spanner. The boiler had these issues from day one but were not as frequent as they are now. I need to restart...

Here is my situation: I have a Vaillant Ecotec pro 28 boiler that is about 1.5 years old. When the heating switches off, the pressure drops and I get an F22 fault code and the heating doesn't come on again until I manually restart the bolier. To get it started again I need to add pressure and...