Radiator controls measure and regulate the temperature every 2 minutes. However, to save energy and minimize DECT radiation, they only communicate with the FRITZ!Box at certain intervals. Therefore, it may take up to a maximum of 15 minutes for the temperature measured on the radiator control to be displayed in the FRITZ!Box user interface.

Temperature-controlled heating systems tend to respond slowly. To prevent a room from overheating or cooling down too much, the radiator control does not immediately move the valve when there are slight deviations from the target temperature. Therefore, observe the heating behavior over a longer period of time by heating the room to the desired room temperature so that the heat can be distributed evenly throughout the room. The time it takes for heat to distribute almost evenly depends on the room height or presence of niches and bay windows, for example, and may take several hours.

Settings of the heating system, such as the flow temperature or a central night setback, can prevent the desired room temperature from being reached. For example, the radiator is heated up by a high flow temperature and radiates this heat even if the valve is already closed. A central night setback to a lower temperature can also prevent the desired room temperature from being reached although the radiator control correctly regulates the temperature.

The room temperature is also subject to temporary fluctuations or fluctuations due to the time of day, regardless of heating output. For example, temporary exposure to bright sunlight or reduced ventilation can lead to an increase in room temperature, regardless of the temperature control by the radiator control.