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Knowledge document #3292
This support document is available for the following products:

After initial installation, "Not connected" is displayed in the FRITZ!Box for FRITZ!DECT radiator control

When you install the FRITZ!DECT radiator control for the first time, you can register it with the FRITZ!Box, and it then appears in the FRITZ!Box user interface in the "Smart Home" menu. However, the connection status "Not connected" is displayed. When you change settings for the radiator control, some of the settings are changed back. The radiator control's displays shows an active connection.


  • FRITZ!OS 6.80 or earlier is installed on the FRITZ!Box.

1 Radiator control cannot be used

If you are using an older FRITZ!Box whose development has been discontinued, you cannot use the radiator control. For these FRITZ!Box models, we will not make FRITZ!OS 6.83 or later available that would allow the use of the radiator control.

2 Installing the latest FRITZ!OS

If you are using a FRITZ!Box for which FRITZ!OS 6.83 or later is available:

  1. Install the latest FRITZ!OS on the FRITZ!Box.