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Can't add Smart Radiator Thermostat to room with Smart Thermostat

Hi all,

I have a strange effect when I add a Smart Radiator Thermostat to a room with a Smart Thermostat. When I add the Radiator Thermostat to the system there is no problem and I can manage it (in a seperate room), but when I move it to the room with the Smart Thermostat the Smart Thermostat set the temperature automatically to 25 degrees. When I change the Smart Thermostat to a normal level, whitin seconds it turns back to 25 degrees. When I remove the Radiator Thermostat from the room this effects disappears. What could be wrong? It has worked for years…..