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Cannot register a FRITZ!DECT radiator control

Registration of the radiator control, for example FRITZ!DECT 301, to the FRITZ!Box fails. After you push the DECT or Connect button on the FRITZ!Box, the DECT connection is not established. The symbol for the radio connection is not permanently shown in the display of the radiator control. The radiator control is not displayed or is displayed with an inactive connection in the menu "(Home Network >) Smart Home" in the FRITZ!Box.

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 twelve radiator controls with the FRITZ!Box. If you have already registered twelve devices, you cannot register any more.

Note:Registering a radiator control does not reduce the number of telephones, the number of DECT repeaters, or the number of smart home devices that can be registered, for example FRITZ!DECT lights, FRITZ!DECT smart plugs, FRITZ!DECT smart switches.

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 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.

4 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.

5 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").

6 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.

7 Re-registering the radiator control

Loading the factory settings of the radiator control

  1. Push and hold the "Menu" button on the radiator control.
  2. If you are using FRITZ!DECT 302, push (next menu page).
    1. Push (load factory settings) and "OK".
  3. If you are using FRITZ!DECT 301 or FRITZ!DECT 300, select the menu item "RES" or "Zurücksetzen" and push "OK".
    1. Push "OK" again.

Establishing a DECT connection

  1. Remove the batteries from the battery compartment on the radiator control for at least 30 seconds.
  2. If the radiator control is not mounted on the radiator:
    1. Click "Smart Home" in the FRITZ!Box user interface.
    2. Click "Device Management" in the "Smart Home" menu.
    3. Click the "Register Device" button.
    4. Within 2 minutes: Reinsert the batteries. Follow the instructions on the display of the radiator control.
  3. If the radiator control is mounted on the radiator:
    1. Reinsert the batteries.
    2. Follow the instructions on the display of the radiator control. The valve adjustment is completed as soon as the preset temperature appears in the display.
    3. Click "Smart Home" in the FRITZ!Box user interface to register it with the FRITZ!Box.
      1. Click "Device Management" in the "Smart Home" menu.
      2. Click the "Register Device" button.
      3. Within 2 minutes: Push the "Menü" button on the radiator control.
      4. Push (start registration) on FRITZ!DECT 302 and then "OK".
      5. On FRITZ!DECT 300 and FRITZ!DECT 301, select the menu item "FUNK" or "Anmeldung", and push the "OK" button.
        The message "Anmeldung war erfolgreich" is shown on FRITZ!DECT 301.
      6. Wait until "SUCH" flashes in the display of FRITZ!DECT 300 and then push the "OK" button.

The radio connection is established as soon as the symbol for the existing radio connection appears in the display of the radiator control.