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It works! My thanks for all the excellent suggestions. I did exactly as suggested - along with my own interpretation of the wiring diagram of the Salus. What I had not appreciated is that this Buderus uses a unique data language on the low voltage side (EMS) so only a Buderus 24v thermostat will...

Thanks, Stem. That is all pretty basic stuff. My problem relates to the strange way that the Buderus behaves when I either disconnect the existing roomstst or connect the new Salus. It fires up and keeps running. I posted the wiring pic as another contributor suggested I should. I am entirely...

Okay, so at last I have a picture. Top left is the 230v arrangement. The mains power for the Salus is taken from terminals L and N (which are also used for mains power IN) Top right is the 24v side. The connection to the roomstat are the two top wires (brown and green/yellow) at terminals BB...

Sure, but it won't be today. Thanks, I will get back as soon as I can get to the installation and take a pic.

Yes, thanks for that. Clearly the boiler responds happily to the existing 'simple' control of the RC 100. I think it would work okay with the Salus if I connect the two (24v) wires that the existing 'stat uses. My problem is that if I turn off power to the boiler it fires up when I restore...

Although I have the purported wiring diagram for the boiler (in Greek) it does not seem to correspond with what is actually there! Currently the thermostat wires go to the 24v bus and I am a bit reluctant to change them from terminals that SHOULD be 1 and 2 but are marked 'BB'.

Boiler: Logamax UO52- 28K Thermostat: Buderus RC 100 (24v) Everything works fine! Trying to change the thermostat for a programmer (Salus) but it will not control the boiler. I naturally assumed it was a Salus problem, but it is not . . after much testing and head-scratching I have discovered...