Recent content by Niggy

Ollski, just re-read your post..... I'm sure I havent seen an anti-gravity valve - would I be right in thinking that this would be located between c/h pump and where it goes up through garage ceiling to h/w tank? If there is not an anti-grav valve + non-return valve is jammed open would...

Thanks for all your help Havent had much time over last couple of days to look in garage but I'll try and double check that c/h pump is working and check out valve tonight. Yes, kevplumb there are screws holding down top-plate on valve. I think I can isolate between c/h pump and valve but...

There are no wires coming from the "box" at all - so don't think its controlling anything I've found the site which made me think that the box was a non-return valve - see SMC controller layout although the pumps look a fair bit newer than the ones in the pic...

Thanks for reply ChrisR I'm pretty sure that I don't have any electrically operated valves like that and I have followed all the wiring i can see from boiler/control panel. I'm also pretty sure that the c/h pump is operating when c/h is on but I shall check again when I get home. Any...

Sorry for my impatience in bumping this but does anyone have any ideas or solutions to my problems or are there any checks I can make to find out what might be wrong???? Actually it might be helpful to confirm that what I have really is a "twin pump" system - it appears that I have 2 pumps in...

After doing loads of research I think I have a SMC twin pump central heating system (after searching high and low for a diverter valve) but I can't work out why my radiators don't work properly. If the heating is turned on, on the control panel, the boiler (Potterton Netaheat) fires up...