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That's got it! All sorted. Can't thank you enough, saved me time and money there big time. Merry Christmas! Best regards, Andy

Well this is wiring behind the old Thermostat in the kitchen, where I've installed the Refoss: And this is the wiring behind the room thermostat: Thank you. Apologies I hadn't responded sooner to your request of a picture, I was being thick and thought you meant the existing thermostat image

For reference here's the connections I made into the Refoss. And here is the ancient temperature selector:

OK, installed and working as per all your advice. Thank you so much! Only issue is the external temperature controller in the other room is still dictating the temperature that the boiler clicks on and off at. Must be wired into the boiler itself perhaps?

Thank you all. I will do that in the morning, let's get it right first time eh!

OK, will do that. Thanks everyone, installing tomorrow so fingers crossed

It does still work, albeit not well. Clicks off randomly.

Wow, that's awesome! Thank you so much! We do indeed have an old rotary thermostat elsewhere in the house. Assuming I can leave this disconnected? Thanks again.

Hi there, I'm replacing a Drayton Tempus 2 with Refoss MTS200 and it's a little unclear which wire goes to where. The existing wiring looks like this: And the Refoss MTS200 looks like this: What shall I connect and where? Any help appreciated. Have trawled forums all over the place...