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Just thought I'd put this down in case others have the same issue. Drayton Digistat 1 resets itself to 20 degrees after battery change. The battery warning light flashes, you check the battery contacts have a good contact (ie bending them back and scratching the surface). You put new...

Top tip ... will put some in. Cheers. http://www.imagesetting.com/

Cheers Kev, last question, I've dropped about 20 litres out of the system (its got 8 rads in a Semi detached house) to do what was required, the system already had rust inhibitor in it, but I've only topped up with fresh water - should I put some more inhibitor in - or will it be OK as it is.

I followed the procedure, much better, but I'm unsure of the pressure in the expansion vessel - its roughly 10psi, the system only seems to expand by 1 Bar when its running hot ... does that sound OK - or could I have pumped too much air in.

Thanks Kev, If thats the procedure then I'll do it, let you know, mustn't forget my Fernox inhibitor, I've had some in the workshop for a few years, does it go off ?

OK, well I found someone had turned the heating temperature dial up to full, which I hadn't noticed, would this have caused the Pressure dial to read above 2.0 Bar ? the temp. dial is at the 3/4 position now. I still investigated the Expansion/Pressure Vessel, when I pressed the 'tyre valve'...

Hi, thanks for the reply, I remember now, a few years ago Vaillant instructing me to simply use my bike pump, and to let a bit of pressure out before hand. Your FAQ suggests 'repressuring', - do I need to go through all that just to put a bit of pressure back in ?

Ahh, is the 'expansion vessel' a green rubber bag you inflate slightly with a bicycle pump ?

I have a Vaillant Turbomax Plus 828e. All radiators are bled. When the system is cold the bar pressure reads 0.8, but when running it climbs over the recommended 2.0 bar, reaching 2.2-2.3 bar, last year it never peaked above 1.5 when hot - any ideas why it should change this year...