During the first months in 2014 everything worked properly. At the end of the heating season, I have removed the batteries and turned on the valves manually. In early November, I have the HR20 again equipped with batteries and reprogrammed. After about a week a device has the error E3 (mechanical error), another E2 (Thermostat not connected). Batteries with new devices replaced on the radiators reversed, still error.
Since the devices added up not even worked three months I am deeply disappoint. The error E3 is the other reviews after a very common problem. I will now look for other devices.
