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Will have a go... . quote="doitall";p="2633882"]In the boiler pic there what looks like a wire sticking up. That cable can you trace it and also the one in the cupoard as they are not the same and should be so there's probably another connection box somewhere.

Please take a look at the other photo of the boiler-end wiring - I've put it last in my album. Does this help? Id this 'the last pic' you refer to?

Well I hoped it would be but it's pale yellow, and the multi-flex cable at the boiler end has (apart from the brown, blue, green/yellow, red and black that are in use) two white cables. And a very thin black one. And no brown. So I wonder if I'm looking at the right cable at the boiler end? It's...

In fact, I've gone ahead with trying it and got it working fine, but at the moment with mains L and N from a cable and plug into a 13amp wall socket. The thermostat controls seem to work fine, and I see that all I need to do now is find that elusive Permament Live. I've tried looking into that...

I've looked through everything you have all been kind enough to provide and explain and I've decided it's too difficult for me to do correctly. I'm v sorry if I've wasted your time. Best wishes, Chris

I am going to work through all this carefully and decide whether or not I should try this or whether I should get a professional. We've had some funny people in here over the years and I wouldn't be surprised if some of the wiring is dodgy. But I would like to thank you all again for taking so...

Brilliant! Thanks! Chris

Thanks very much to everybody for all this - I'll give it a go and report back... Chris

The Room Stat label is in the top circle on the picture.

I've taken a better picture, with Room Stat cable marked. http://www.diynot.com/network/ChrisSykes/albums/14786/54890 Chris

Yes, of course. Sorry

OK - will do that tomorrow morning. Thanks. Chris

http://www.diynot.com/network/ChrisSykes/albums/

Found it - a bit difficult to get at, and the picture isn't brilliant but I hope it will help? I'm beginning to wonder if should be getting a professional - but if I can do it correctly, I'd like to... The new picture is in the album. Chris...

I've added two new pictures to my album. Looking at everything, it seems to me that I need to connect the Receiver N/O to Potterton/Honeywell SwL (red wire) and Receiver COM to Potterton/Honeywell L (black//yellow wire). And of course the mains feed (blue and brown) from Potterton/Honeywell to...

OK- will open it up and try to get a better picture of the layout. Chris

I don't think my pictures are showing up here. Maybe if I put a link to the album you could have a quick look? Is the Suprima wiring block picture clear? Thanks again! http://www.diynot.com/network/ChrisSykes/albums/14786 Chris

Hi Doitall and Picasso, Thanks for taking an interest. I'm not sure I've got the hang of how to reply, or to show my pictures but I'll try now. There are only two wires to the old room stat, Yellow to 3 and Red to 1 - photo in my album. I thought I'd like to install the Receiver on the...

I would be very grateful if anyone there could spare a moment to help me with this. I want to install a Salus RT300 RF unit with my Potterton Suprima HE boiler, instead of the existing room thermostat on the wall in the hall. I have read the posts and looked at the Salus and Potterton...