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Cannot register a FRITZ!DECT radiator control

Registration of FRITZ!DECT 301 to the FRITZ!Box fails. After inserting the batteries into the device, "Gerät wird vorbereitet" and then "Gerät wird angepasst" are shown in the display, but the DECT connection is not established when you push the DECT button on the FRITZ!Box. 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".

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 FRITZ!Box model is not supported

FRITZ!DECT 300 and FRITZ!DECT 301 cannot be used with FRITZ!Box 7412, 7312, 7330, 7330 SL, 7360 SL, 6360 Cable, or 6810 LTE.

2 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.

3 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.

4 Disabling "Reduce DECT field strength"

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

6 Enabling encryption

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

8 Re-registering the radiator control

Loading the factory settings of the radiator control

  1. Push the "Menu" button on the radiator control.
  2. Select the menu item "Zurücksetzen" and push "OK".
  3. 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. First "Gerät wird vorbereitet" is shown on the display of the radiator control, then "Gerät wird angepasst", and the connection to the FRITZ!Box is established.
  3. If the radiator control is mounted on the radiator:
    1. Reinsert the batteries. First "Gerät wird vorbereitet" is shown on the display of the radiator control, and then "Gerät wird angepasst".
    2. Push the "OK" button until "Gerät wurde erfolgreich installiert" is shown in the display. The valve adjustment is completed as soon as the preset temperature appears on 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, select the menu item "Anmeldung", and push the "OK" button. The message "Anmeldung war erfolgreich" is shown on the radiator control.

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