FRITZ!Box 6840 LTE Service - Knowledge Base
Cannot enable DECT Eco function
The "DECT Eco" function is grayed out in the FRITZ!Box user interface and cannot be enabled.
1 Cannot use function for technical reasons
For technical reasons, the "DECT Eco" function is no longer available when a radiator control (for example FRITZ!DECT 300), a FRITZ!DECT 210, FRITZ!DECT 200, a FRITZ!DECT Repeater 100, or a FRITZ!Box in DECT repeater mode is registered with the FRITZ!Box.
Note:If you are no longer using the above-mentioned devices, you can delete them under "Home Network > Smart Home" or "DECT > DECT Monitor" in the FRITZ!Box user interface.