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Apologies... I THINK i have it sorted! Had to bind the relay with the thermostat (which it told me I didn't have to do... but nevermind!) :D

Hello... it's me again! I've finally got the honeywell CMT927 and it's all wired up as you suggested, but now I have some other issues, if you wouldn't mind pointing me in the right direction? The boiler won't fire at all. Even when putting the timer switch to ON it still won't fire...

Awesome!! :) I'd rather get the Honeywell... it's had much better reviews, and looks nicer too. That's it from me... yet again, this place is brilliant, a great asset! Can't say thanks enough! :D

Okay then... I'll try those things, and see how it goes. Sorry, I've got another question, and then I'll leave you alone :D If I was to sack the whole Drayton system, and instead go for a honeywell RF thermostat and receiver, would I need to do more than simply wire the new receiver...

Righty then... after the multimeter testing, the timer is DEFINITELY faulty. Which is also what the Worcester guy said... sooo... I've decided to plump for a new digital thermostat, in the form of the RF701. Now, this will completely over-ride the timer, and therefore despite it being...

I know how to use the multimeter, the basics of what to do and what not to do... I don't know which terminals to test on unfortunately. Thankfully help is at hand... And I am being extremely cautious while investigating. Will be back with the multimeter results later

Excellent! Thanks very much for the extensive help you're handing out! Just as a note on the small plug for the timer... hypothetically... what would happen if the small plug was put in the wrong way round? What I'm getting at is, what if the original person installing it removed the pin from...

Just a bit of further info on this... my boiler appears to not fire up at all when in 'timed' mode. Even if the thermostat is telling it to, the SCR turns on the green light, but the boiler won't fire... hmmmmm... any ideas? I guess this is why the original installer must have wired it...

Just checked on their website... the MT10 is compatible with the boiler I have, need to to find out if the Drayton SCR is too. So maybe I have to call someone out afterall :( Will have a go at Worcester and see what they say. Thanks again

Ah, okay... so the over-ride works if I take the batteries out... just good to see that something works properly. You are correct with your description of what is going wrong... So, the timer unit is a Worcester-Bosch 'MT 10' I've flicked through the booklet, and it seems it...

Thank for that... all done, but all is not well still. I've wired as you said... also reset the RF Thermostat, and the SCR... but now the over-ride button doesn't appear to do anything (not sure it did before-hand actually), and the boiler won't ignore the ON signal if the timer switches are...

After reading my description, I thought I should take a picture just to illustrate it better. Here it is:

Okay... here goes. The boiler is a Worcester Greenstar 28i Junior... and I had a look at the wiring inside, it is as follows (it was too confined to take a decent photo, so filmed it and am relaying what I see.) RED - LR (from the SCR) BROWN - Ls (from the SCR) BLUE - Ns (from the SCR)...

Okay... thanks very much for your responses. I'll have a look at the exact boiler model and get back to you tonight. I had a quick look yesterday but couldn't see the model number... and don't have any instructions on it anywhere (thanks to the previous owner). Also, I can't seem to...

Here is a photo of the RF unit, and the wiring inside... Now, I couldn't get the boiler front panel off unfortunately. Is this photo enough to go on? I understand your comments, but clearly a professional has been called in to install this boiler at some point, but also got it wrong...

Fortunately there's plenty of slack in the cable, so would prefer to use that I think. Am I okay to take the front off the boiler? Not illegal or anything is it? I'll take some photos of both ends of the cable and let me know what you think... Thanks!

Yes, it is right next to the boiler. I have a very basic wiring diagram, but it doesn't make much sense... I don't have a clue what the 1, 2, 3, 4 stuff if on about, and what colour wires need to be connected to the respective numbers/letters. Surely N is Neutral, and L is Live... I'm not...