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Thank you for replying, I will probably leave my system as it is currently set as most days the solar heats the hot water so I only want the gas to top it up on the greyer days. I’ll get my wife to put an extra jumper (or 2) on!

I live in hope!

Thank you so much for your helpful answer. Why are you even bothering to reply if you cannot or will not help? FYI the instructions consist of around 5 booklets and not a single one appears to say that hot water and CH cannot be supported at the same time. Given my past systems have be able to...

Yes, it is a nuisance more than a problem. I have a Power Diverter from my Solar Panels that diverts excess to my immersion so I get free hot water on mostly sunny days. That means I do not want to heat the water using gas until near sunset (and the temp on the immersion is set higher than the...

Thank you very much for that. Annoying as my other systems have never had that limitation. I had hoped there would be something on the VRC 470f controller under the installer level settings that I could change.

It is the Vaillant Eco Tech Plus VU condensing boiler with the VRC 470f Controller and VR66 Control Centre Read more: https://www.diynot.com/diy/threads/vaillant-ecotech-plus-no-heating-when-hot-water-is-on.581372/#ixzz7CSX7d53V

It is not a Combi Boiler. It is a pressurised system with a hot water tank.

It is the Vaillant Eco Tech Plus VU condensing boiler with the VRC 470f Controller and VR66 Control Centre

I know that. As I said it works fine on the timer it just seems that it will not support the central heating and the hot water at the same time.

Yes to weather comp. How do I change priority please?

I thought I should be able to do it but how?

I have this Vaillant in a pressurised system and have the VRC 470f controller. Heating works perfectly on the timer as does the hot water. However, I cannot have hot water and central heating on at the same time. Normally not a problem as it is rare for us to need both on. However, at the moment...

Such a great resource. My Vaillant outdoor sensor failed a few weeks ago. Called Vaillant and they quoted in excess of £300 to fix (evidently their warranty is only for the boiler and not the rest of the system!). Found a Vaillant sensor for £199! Bought the Glowworm sensor as described, also...