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Holy crap! It only bloomin' works! At least I think it does, it turns on when I increase the temp on the stat and off when I reduce it, and the pump isn't going constantly any more. I can't thank you guys enough for your help, especially @ianmcd and @Chris_W . And @ericmark for the link...

Right, to find that tiny flat head screwdriver I have somewhere...

It looks like what you said is already connected. So I just swap these over one for one and I'm done? :cautious:

They don't seem to want to write them for people who don't know what they are doing I guess :unsure:

It says remove the red link if you are using it volt free, then talks about COM and NC wires. I can't imagine there is something in the SL off that shouldn't be as it used to work, and nothing has been changed. I don't know how many wires I have connected to the current one as I haven't taken...

And the manual

Oh :(

So I have had my transmitter and receiver delivered today. Set the transmitter up to work in the hope it was that that is the issue, but no, the receiver behaves in exactly the same way as with the old transmitter, turns on but won't turn off. So it looks like I have 4 wires to attach to it -...

I will. Thanks guys. Claire

@Chris_W at the risk of ignoring what is probably good advice, I think I'm going to stick with what I know for now. I've ordered the one for £30 that @ericmark has linked to - actually ordered it this morning when i realised the address change hadn't worked. For that money, if I knacker it up...

I'm not sure if Father Doogle is going to be able to help... :D

@ericmark Thanks for your reply, but as I have no idea what most of that means :oops:, I'm going to take the easy option and replace like with like. I can literally then just unscrew wires and reconnect. My boiler is a BAXI 105 HE, it's been in a good fair years, but has been serviced every...

So the light going off isn't good enough I take it?

Sadly it didn't work. I turned off the 5th DIP and took out the 5th jumper, and once again it turned on the system perfectly. Now the bloody green light is shining down at me again. I am known for my excellent 'being able to use a hammer for all jobs' and I feel like this might be heading...

So I've changed the address code and I still have the same issue. Is sounds different to what you had though, because it the transmitter seems to send the 'turn on' command IMMEDIATELY, and I mean it's almost instant, just not the 'turn off' command. I've worked out a really convoluted way of...

Don't worry, I'm perfectly happy to have a bash at most things, and I've not electrocuted myself once yet :D Thanks again for your help. Claire

Hence I used inverted commas on the word frequency. The frequency is 434 MHz and can't be changed, I realise that. I know you say just get new, but new what? New transmitter? New Receiver? totally new thermostat? Which will need wiring in I assume by a competent person? Surely it's better...

Will do. Thanks.

Damn, I was hoping it would be the thing that isn't wired in... Thanks for your help all, I will give the address code a go when it's light tomorrow and update. Claire

Yes it did. So if it's communication, I can try changing the 'frequency' using the jumpers, but if that doesn't work, is it more likely it's the transmitter or the receiver or is that impossible to say?