Three-Port Valve??

[Stingray13]

I was called out a few weeks ago to a boiler where the radiators where not getting warm at all but they had HOT Hot water, upon investigation I'd worked out it was wired up incorrectly so i called a sparky and got it put right well now the Rads are lovely but the water is warm not hot!!

I'm thinking three port valve when i force it open it seems to work i have replaced the sycron motor to no avail, but i am wondering if the body is a little blocked or just a knackered spring working the wrong way round for so long.

But i'm not 100% certain on this and i have that nagging feeling that something isn't quite right with my diagnosis would appricate any Suggestions or if anyone agrees

 

[bobbo85]

is it on the right way , i know its a daft reply but?

 

[Stingray13]

Honestly nothing daft in this house been incorrectly working for years only reason they noticed it and called me was because the cylinder has scaled and subsequently noticed heating problems.

I am sure it is on the right way,

 

[bengasman]

Have you checked that when dhw calls, the rads are off and vice versa? If the timer allows to do so, I always set it to run at different times. That way the heating works faster and the warming up of the cylinder too. A new model cylinder can take more than 10 kW as far as I know