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Ladies and Gents, Well, thanks to this forum and particularly to those who have contributed to this thread and provided invaluable info - IT WORKS!!! :lol: I have now 'rewired' in part the system to completely remove the overrun cabling/connections, and the system is now correctly...

Thanks Dave, I've just worked through this on paper - think I have worked out which is switched live at junction box - so can then disconnect this and then on the boiler also disconnect from the sw live point and put the (currently) connected to P/F overrun point to the switched live on the...

Thanks Agile, I was intending at some point to replace the rads, hence no TRV's. I will be getting them back out to sort it out though, but am gonna have to wait until I can get some more time off work. Last time I'll be using that company!!

Thanks for the help baxpoti. I've played around with the wiring to no avail. I've tried to replicate the manual, but doesn't seem to work :? Have tried to wire boiler into orange wire of valve as per diagram but can't get any joy! So, time to get someone a bit more knowledgeable to have a...

Ok, you've been a great help. If I could just confirm a bit further - my old boiler had a pump overrun which is wired into the programmer upstairs, hence 2 cables running from the programmer to the boiler. The overrun on this boiler is optional? ie can it not be used at all and therefore...

Thanks Baxpoti. Removed wire and correct, pump did not run, although green light on boiler was still lit (I did turn the power off to remove & isolate wire!). In terms of rewiring pump - is this straightforward? And how would I do this?

TRV's I am assuming these are the temp valves on each rad - in which case I don't have ANY of these - just flow valves (they're 23 years old). Yep, green light on boiler stays on The other wire not connected to anything is brown (NB this is the wiring scheme that was installed when house...

Hi, Yes - connected to the 'optional pump feed' terminal is a blue wire tagged with red electrical tape... Noting something about TRV'd systems not needing a room thermostat - I have one but it doesn't switch the system off once satisfied as far as I can tell... Also tank thermostat...

Thanks guys. A slight update. I woke up in the middle of the night to all the heating on - even though the programmer was off! So had to completely switch the system off. So it seems that the boiler is heating whatever circuit the last position the mid-valve was at. Turned system back...

If it helps, Switchmaster had: Blue Yellow Orange White Red Earth Rewired as: Blue White Orange + red Grey -- Earth IIRC Does this offer anything further - much appreciate your help :)

Yes, but looped the red to orange iirc - was a little while ago... is this leading somewhere?

Urm, yep! Had a new 3 way valve put on, but because it was old switchmaster replacement it needed 'shorting' two wires - or at least wiring 2 together which were previously seperate due to old switchmaster valve having 6 wires and new valve only 5. Took plumber nearly all day and left it not...

Anyone any thoughts? Wiring seems the most likely...

Thanks for the quick reply. The valve was replaced a couple of months ago and was working fine with the old boiler (I had to wire it as the 'plumber' couldn't get it working back then!). So in terms of wiring the only change I am aware of is wiring in the new boiler - no wiring of anything...

Hi all, I have today had a new Baxi Solo HE 15 installed. I have a fully pumped system. New Diverter valve, Grundfoss pump 2 years old ish, so quite new & working fine (currently on lowest of 3 speeds). Potterton programmer EP2000/2 (16 programme). Recently installed. Old boiler...

Excellent - thank you very much for v helpful and prompt reply - v grateful :)

Thanks guys, puts me a little more at ease!! Just to be really clear - even when heating and hot water are both off and system is cold, actuator will still remain hot if anything other than hot water was last call? Cheers again!

I have recently had a Tower actuator installed (with new valve also) and ended up having to finish the job myself!! The concern I have is that mains power is removed and switched back on, the actuator sits in its de-energised position and remains cold (as I would expect). When either...