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Knowledge Base document #3535

FRITZ!DECT smart switch often loses its connection to the FRITZ!Box

The DECT connection between a FRITZ!DECT smart switch, for example FRITZ!DECT 440, and the FRITZ!Box is frequently lost. The connection status "Not connected" is displayed in the menu "Home Network > Smart Home" of the FRITZ!Box user interface.

Simply proceed as described below. After each measure, check whether the problem is solved.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Installing the latest FRITZ!OS for the FRITZ!Box

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

2 Updating the firmware of the FRITZ!DECT smart switch

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Mesh" in the "Home Network" menu.
  3. Click "Perform update" next to the respective device.

3 Checking the battery level

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Smart Home" in the "Home Network" menu.
  3. If available, select "All Smart Home devices" from the drop-down list "viewing".
  4. Click the button (Edit) for the respective device.
  5. Check the battery level.
  6. If a low battery message is displayed, replace the battery in the device with a new one.

4 Turning off other base stations

  1. For testing purposes, switch off other base stations in the vicinity of the FRITZ!Box.
  2. If the problem no longer occurs then, switch off the other base station or place the base station farther away from the FRITZ!Box.

5 Disabling 'Reduce DECT field strength'

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Disable the option "Reduce DECT field strength" in the section "Radio Field Strength".
  4. Click "Apply" to save the settings.

6 Removing USB 3.0 devices from the FRITZ!Box

  1. For testing purposes, remove all of the USB 3.0 devices from the FRITZ!Box's USB ports.
  2. If the problem no longer occurs then, a USB device was interfering with the radio connection. Eliminate the interference caused by the USB device.
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