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Hi stem, thanks for your reply. Yeah, I thought about that little triangle being something of interest, but it is just a plastic piece that covers more plastic: I also tried to move the outer ring with a Philips screwdriver, but to no avail.

Hi, I just moved in to a flat that has a TRAC T 45 installed that controls the boiler. I already looked online on how to configure it, but couldn't find anything. Can anyone here help me? I am attaching some pictures that I took from it. Many thanks in advance.