The radiator actuator is equipped with an automatic "window open detection" which is switched off at the factory. As soon as the radiator actuator detects a cooling by more than 0.3°C within 2 minutes, this is evaluated as "window open" and the thermostat is closed for 15 minutes. OPN is displayed on the radiator actuator and the setpoint temperature jumps to 4°C in the HomePilot. No entries can be made on the device for 15 minutes.
After 15 minutes, the temperature is reset to the last set temperature.