Recent content by YorkyBar

Replaced the motorized valve (v4043h)and all is working now!

Thanks for the link. The exact model is this one: www.bssindustrial.co.uk/download/371/Wiring%20Centre.pdf I checked the voltages with the HW on and when the HW had cut out. The voltages on the cylinder stat and timer are the same before & after the HW cut out - so I think they are...

The timer is electronic (Horstmann CentaurPlus) - and I think the cover is glued down so I couldn't open it! I reset the device to factory default but it didn't help. Do these electronic timers often fail? I could check the Honeywell control board that the timer must be wired into, to check...

That's a good point, thanks. I will have a look tonight.

I have a Potterton Prima F 60 (not a combi boiler). I have been using the hot water on a daily basis. I recently used the central heating and it works fine. At roughly the same time (coincidence?) the HW stopped working. When I turn on the HW, the boiler fires up, the pump comes on and...