CH not working - pump and valves are working but no CH

[afclucas]

My heating decided to stop working last Friday. I replaced my pump last year so I didn't think it was that, but I check it with the screw driver anyway and it is working fine. I then checked my 2 port zone valve, that wasn't working, so I brought a Drayton 2 port zone valve from B&Q, replace it and wired it as the old one. It didn't seem to work though. I look on the net for further wiring information and eventually found a solution that when I activate CH on my programmer the valve motor works and the pump starts too. But the rads still don't heat up??? I have hot water still but the rads are totally cold, including the feeding pipes either side of the rads.

Any help would be much appreciated.

Thanks

 

[Softus]

Do you have only the one zone valve?

If so, then does the pump run only when the valve opens?

 

[afclucas]

I have two zone valves. One for water and one for CH. I notice however that the pump and CH valve were both working even though the programmer said CH was off. Could it be the wiring? Do you know where I can get the correct wiring diagram for Drayton ZA 5/679-2 (22mm) zone valve?

Many thanks

 

[seco services]

s plan wiring diagram

 

[afclucas]

Thanks for the diagram, does it matter that I don't have a room thermostat?

Would wiring it wrong mean that is why my Rads aren't getting warm?

Mank thanks

 

[twgas]

if you dont have a room stat the brown from ch valve should go to 4 instead of 5

 

[afclucas]

Cheer mate,

I've wired it to the diagram, I've put a pic on does it look right if you can tell? The valves and pump seem to be working the boiler has fired up when switch on for CH. still not getting anything to the rads though.

Any guesses??

//www.diynot.com/network/afclucas/albums/

 

[twgas]

wiring looks ok from what I can make of it

right, lets start from scratch:

turn programmer to HW off, CH off. Does pump and boiler turn off and are both valves shut ?

 

[afclucas]

pump and boiler both turn off, valve for CH heating shuts but the HW is still open.