Vaillant Ecotech Plus No Heating when hot water is on

[MikeJS]

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 my wife is recovering from an op and needs more heating! If the heating is switched on before the hot water is due to come on via the timer then the hot water does not heat up. Conversely, if the hot water is already on the rad will not heat up. My previous systems in other houses could always do both. Is this a fault, a setting issue or a feature?

 

[ianmcd]

you should be able to control both independently

 

[MikeJS]

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

 

[picasso]

You probably have hot water priority, does your system have weather comp fitted ?

 

[MikeJS]

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

 

[picasso]

You can set the hot water times in the programmer.

 

[muggles]

What model is it?

 

[old duffer]

I thought it was common knowledge that combi gives one or the other, never together..its can't

 

[ianmcd]

which ecotec plus boiler do you have

 

[MikeJS]

You can set the hot water times in the programmer.

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.

 

[MikeJS]

What model is it?

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

 

[MikeJS]

I thought it was common knowledge that combi gives one or the other, never together..its can't

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

 

[MikeJS]

which ecotec plus boiler do you have

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/...ng-when-hot-water-is-on.581372/#ixzz7CSX7d53V

 

[Harry Bloomfield]

you should be able to control both independently

Not with the VRC 470f - It is either HW or CH, but not both at the same time. It uses a fancy predictive system to set the boiler flow temperature, to suit the CH demands. It cannot combine that, with the demand for the maximum flow temperature for heating the HW - so it does the HW and CH at separate times, sequentially, with priority given to HW. Maximum flow temperatures for each mode, are settable at the boiler.

 

[MikeJS]

Not with the VRC 470f - It is either HW or CH, but not both at the same time. It uses a fancy predictive system to set the boiler flow temperature, to suit the CH demands. It cannot combine that, with the demand for the maximum flow temperature for heating the HW - so it does the HW and CH at separate times, sequentially, with priority given to HW. Maximum flow temperatures for each mode, are settable at the boiler.

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.