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Knowledge document #1224
FRITZ!Box 7390
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Cannot register FRITZ!DECT Repeater

Registration of a FRITZ!DECT Repeater to a FRITZ!Box fails. After the automatic configuration, the DECT LED on the repeater flashes continuously and the DECT connection between the FRITZ!Box and repeater is not established.

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

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

1 Maximum number has been reached

You can register up to six repeaters with the FRITZ!Box. If you have already registered six repeaters, you cannot register any more repeaters.

Note:Registering a repeater does not reduce the number of other devices, for example telephones or radiator controls, that can be registered.

2 Unlocking the buttons

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Buttons and LEDs" in the "System" menu.
  3. Click on the "Keylock" tab.
  4. Disable the "Buttons locked" checkbox.
  5. Click "Apply" to save the settings.

3 Installing the latest FRITZ!OS

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

4 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.

5 Disabling "DECT Eco"

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

6 Enabling encryption

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Enable the option "Permit only secure DECT connections (recommended)" in the section "Security".
  4. Click "Apply" to save the settings.
  5. If the option was disabled, you must then restart the FRITZ!Box once using the user interface ("System > Backup > Restart").

7 Setting a PIN

For automatic registration to work, you must set the PIN to "0000" in the FRITZ!Box user interface:

  1. Click "DECT" in the FRITZ!Box user interface.
  2. Click "Base Station" in the "DECT" menu.
  3. Enter "0000" as the PIN in the section "Registration".
  4. Click "Apply" to save the settings.

Important:The PIN may not be changed even after you have successfully registered the repeater!

8 Re-registering a repeater

Deregistering a repeater

  1. Push and hold down the DECT button on the repeater twice in a row for at least 6 seconds each time.

The DECT LED flashes as soon as the repeater is deregistered.

Restarting the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Backup" in the "System" menu.
  3. Click on the "Restart" tab.
  4. Click the "Restart" button.

Establishing a DECT connection

  1. Plug the repeater into a power outlet near the FRITZ!Box.
  2. Click "Home Network" in the FRITZ!Box user interface.
  3. Click "Smart Home" in the "Home Network" menu.
  4. Click the "Register Device" button.
  5. Within 2 minutes: Push the DECT button on the repeater. Hold down the button for at least 6 seconds until the DECT LED starts to flash quickly. The repeater is in registration mode as long as the LED flashes rapidly.
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