If the FRITZ!Box loses power, if there is no internet connection, or if the DECT connection is interrupted, the settings of the radiator control, for example FRITZ!DECT 302, remain intact, but automatic switching of the devices is limited. For example, routines can no longer be triggered and access via FRITZ!App Smart Home is not possible.

However, a functioning FRITZ!Box with an internet connection and an existing connection to the radiator control are prerequisites for smooth and correct operation.