Recommend:
To the knowledge base
Knowledge document #3523
FRITZ!DECT 301
This support document is available for the following products:

Behavior of FRITZ!DECT radiator control in case of power or internet failure

If the FRITZ!Box loses power, all of the settings of the radiator control, for example FRITZ!DECT 301, are retained and the devices continue to switch automatically. This is also the case if there is no internet connection or if the DECT connection to the FRITZ!Box is lost.