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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...

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...