Hot water too hot

[markysparky]

Hi

I have a central heating system which is old but works fine but the hot water is too hot. It is fine when the heating is not one, as in it works off the cylinder stat but when the heating is on, the hot water is boiling. I have changed the 3 port valve as this was playing up and the problem was there before I changed the valve. Any suggestions?

Mark

 

[heliotrope]

It would seem that the 3 port is still sticking or has been wired up wrongly.
Did you change the complete valve or did you replace only the power head?

 

[markysparky]

Head and valve changed but I have just discovered bloody immersion has managed to get switched on. Rammed in towels or my little one!! llI know later if the water cools if that was the problem.

 

[markysparky]

C/H not been on all day. Water is still boiling despite isolating the immersion. Any other ideas?

 

[desrob]

C/H not been on all day. Water is still boiling despite isolating the immersion. Any other ideas?

yes get a qualified heating engineer in,thats just my opinion.!

 

[nickelarsed]

C/H not been on all day. Water is still boiling despite isolating the immersion. Any other ideas?

You sure the cylinder stat is working? I would give it a test just to make sure. Make sure it's wired in right too. If it's boiling when the ch is off then its not doing it's job one way or another.

 

[bob the plumber]

lots of things need checking

wiring of 3 port valve? dodgy valve
cylinder stat settings?
reverse circulation?

like above if you got a pro in he would have it sussed in 5 minutes and probably corrected in an hour 🙂

 

[markysparky]

Something else I have just remembered. Hot water works perfect in the summer. The c/h is not on timer or constant and the h/w works correctly via the stat. Its just when the c/h is on timer or constant. Valve working fine. Any comments