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D_Hailsham thank you very much. It works now as it should and lucky enough I guess because nothing got damaged. Thanks again. :D

Hi everyone, I am Alex and am a new member here from Athens Greece. I would like to ask for your help. I have an autonomous natural gas Heater (no boiler) with a thermostat HLcontrols ETH-4. I bought a wireless thermostat Siemens Rev24RF and I would like to install it. Wiring on ETH-4...