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Yes Tony, it works exactly as you said, and it seems reliable enough. This is why I suspect it must be the fixing which was in the wrong position, but I don't want to dismount the heater again... The fixing which I now placed reversed is the S54663 part on the following image...

Well, the good news is my heater seems to be working fine again, but I'm not sure about the root of the problem. I've disassembled that motor on the valve head and examined it's working. Everything seemd fine with it, but I found something interesting about the fixing of the motor. The original...

Seems exacly like mine. It moves so it must be not totally dead, but the moving distance may be too short to push the valve's pin correctly. I will disassemble it and we'll see.

Thank you very much for your reply! I'm guess my problem is the motor too, because I've replaced the valve fully, however not sure about it. Now it's not clear for me what helped for you, have you changed the valve or the motor on it (maybe bad wording only)?

Hello IronNaz! Have you resolved your problem with your SD? I also have a SD heater, mine is a Themaclassic F24AS and maybe I have a somehow related problem with it. Actually, when central heating is on the hot water diverting into the DHW circuit resulting really hot water in my external...