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:D Great post, made me laugh so thanks very much. Your description is as I understand the system. Anyhow I took a look at both MV valves, when the CH is selected one motor opens, the other closes - I saw this by removing the actuator heads. The physical valves also BOTH operate normally - the...

Thanks very much for that, it's very useful. I think I know which is which but I'll test as you explained to be sure. I'm working away again so I'll try it on the WE. A couple of things though, I did look for the small lever you mentioned and I couldn't see one? Maybe I just missed it or is it...

Pete, I thought these were the motorized valves. https://onedrive.live.com/redir?resid=ba01712a186689a2!3788&authkey=!AKGEosdSYDfcZuU&v=3&ithint=photo%2cjpg There's another picture showing the isolation valve for the pump. There's no problem in the boiler firing when the cylinder/tank is cold...

Managed to find the pump and valve(s) - there are two and they are under the downstairs floor (hence the mess). Take a look at the 5th and 8th photos here https://onedrive.live.com/redir?resid=ba01712a186689a2!3782&authkey=!AP3Trgt5JPAUm1Y&ithint=folder%2cjpg. The 5th shows the valves and the...

Thanks for all the help and advice so far but the hot water still doesn't get hot. Here's what I've tried. 1. I bled a downstairs radiator (very slowly) and eventually the small F&E tank in the loft started to fill. 2. The knurled nut on top of the manual bleed valve (in picture 2 of my...

John thanks, I was able to undo the knurled nut on the top of the valve all the way .. nothing came out at all, no air or water. The central heating works fine standalone. Just can't get the water in the cylinder to get hot (without using the immersion heater).

Thanks very much. Unfortunately I'm working away at the moment so can't get to the system till Wednesday evening. I'd like to understand your logic though so would you mind expanding? Is this the kind of system you mean? http://www.muswell-hill.com/foxandco/images/openvent.gif

Hello Forum, I was hoping to get some advice for a problem we have with our central heating hot water. I'd just like to make doubly sure there isn't a quick/obvious fix before calling in a gas fitter/plumber as good (trustworthy) ones seem to be like hens teeth where we live. Anyway, the...