Central heating not heating house to desired temperature - Weather Compensator

[matthew.austen]

I had a new Vaillant Boiler (ecoTEC plus 831) and Weather Compensator (VRC 470f) fitted a while back but during the recent cold weather have noticed the house isn't reaching temperature.

I have the desired temperate set at 21oC but on cold days it can take hours for the house to reach this temperature when the outside temperature is around 5oC. I've noticed the radiators are generally warm but not hot and the boiler display shows the central heating water is around 40oC. The night temperate is set at 18oC and regularly drops below this level.

At first it though it maybe a problem with the radiators and plumbing which is quite old but now not sure as I don't think the boiler is heating the water hot enough. Surely when it's cold and the desired temperature hasn't been met the boiler should be heating the water up to 75oC?

Any ideas what could be causing this issue? Hot water provided by the boiler is fine.

Thanks in advance.

 

[scorps]

Speak to Vaillant these weather compensators are'nt set as a roomstat out of the box so until it is set-up as a roomstat it wo'nt work.I can't find anywere in the instuctions explaining how you do this.On the two occasions Iv'e fitted them a Vaillant eng.had to come out to set it up,I was'nt there to learn how he did it

 

[matthew.austen]

I'd prefer to use the product as designed. I also get the same issue when setting it in party mode which I understand makes it work like a room stat.

Thanks

 

[doitmyself]

The heat curve is too low. It's probably set to about 1 and should be nearer 2.

Some experimentation will be required to get it right.

Read the 470f Installation Manual

 

[Baloo790]

Are these weather compensators a gimmick?

 

[Ermintrude]

No they really work well when set up properly.

 

[dancinplumba]

They only work well in well insulated properties

 

[Ermintrude]

Easy test push the two buttons on the boiler with a ladder and two brackets under them. Push and hold them together. Boiler will take off and rads will melt defo comp issue

 

[Baloo790]

Hmmm, maybe I will give one a go.

 

[Ermintrude]

It's not going to cause any harm its called "chimney sweep"