New three point valve - heating and hot water at same time

[Lei]

Hi,

We have fitted a new three point valve (Drayton) however everytime the hot water is on the heating is also coming on. We didn't have this previously - both worked ok on their own.

Any ideas what may be causing this?

Thanks

 

[45yearsagasman]

Your wiring needs checking to start with. What brand of valve did you replace and why?

 

[dilalio]

Drayton are crap!
If it was all working previously why did you change it? (as 45years asked).
Did you change the whole valve or just the head?

 

[Lei]

I believe it was the motor which went in the one we had - we replaced the entire part.
before the motor went we were able to get hot water and heating separately - thanks for the advice we will check the wiring on it.

 

[dilalio]

Wiring fault. Or faulty replacement. Check and test.

 

[Agile]

Hopefully the valve is fitted the correct way round?

Did you fit each wire to the same place as the old one or did you try to rewire it according to the diagram?

Tony

 

[Lei]

We refitted the wires to the same place as the old one - the instructions provided are very poor and unclear.

Thank you

 

[dilalio]

And is it the right way round?

 

[Echo the husky]

If it is a wiring fault it is likely the white wire is connected to the wrong place. My guess is it is connected to HW on instead of Heating on.

 

[leakydave]

Port A goes to heating, Port B goes to water heating

 

[Lei]

Thanks for your help - port a and b were round the wrong way - we have changed this and now we can't get the boiler to ignite at all! It stopped igniting just for a day before we changed the valve to the right way round. Think I will have to call someone out!

 

[dilalio]

Thanks for your help - port a and b were round the wrong way - we have changed this and now we can't get the boiler to ignite at all! It stopped igniting just for a day before we changed the valve to the right way round. Think I will have to call someone out!

I would call a heating engineer rather than the very general term "plumber"!

 

[Steelmasons]

Why alter the wiring when swapping valve orientation?

 

[Steelmasons]

I would call a heating engineer rather than the very general term "plumber"!

A good plumber will knock spots off a heating engineer.

 

[dilalio]

I would call a heating engineer rather than the very general term "plumber"!

A good plumber will knock spots off a heating engineer.

If you know a good plumber is who you've got!