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Thanks Dave - that makes sense.

Gasguru If there is a leak: 1. Why, when I switch off the heating and allow the pressure to fall to .5 or less, does the pressure then rise again to the original reading when I switch the heating back on? If water had leaked from the system wouldn't it be unable to get back up to pressure...

Thanks Folks I'll consider those three options - EXV not correctly charged / gas valve failure / leak in system (though I've checked all the rads and joints I can see - which means lifting floorboards I guess!)

Hi All Help please! I have a Vaillant 824E Turbomax. When it is running in 'constant' with heating and hot water on it is fine - pressure 1 to 1.5 bar. If I switch heating off it gradually loses pressure for about 4 hours then locks out with code F.28 (note not F.22). If I recharge to...