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When I go through the installer menu I have it set to 60C at the moment. I don't think the connection with the VR10 is quite as good as it was with the original thermostat as it was set on 60 before with that but the cylinder/water not as hot. And on the actual boiler it's et to 65

I took some photos if that helps: This flashes constantly when trying to adjust and won't accept any changes, although when I go into the installer menu it seems to let me adjust it there (and works when the programmer comes on). During cylinder boost it is fixed at 5 degrees which I assume...

Hi all, newbie here. Less than a year ago I had a new Vaillant Ecotec boiler installed with a VFT350F controller. It connects via a VR65 control box to my existing honeywell gravity fed cylinder. It works well when programmed to come on, but I have never been able to get the 'cylinder boost'...