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Knowledge document #3542

Cannot register FRITZ!DECT 500

Registration of the LED light FRITZ!DECT 500 to the FRITZ!Box fails. After you push the DECT button on the FRITZ!Box, the DECT connection is not established. The LED light flashes red several times and then glows red.

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 Removing incompatible DECT repeaters

If a DECT repeater from another manufacturer or a FRITZ!Box 7390, 7270 or 7240 configured as a DECT repeater is registered with your FRITZ!Box, you must remove it. The LED light cannot be used with these DECT repeaters.

Note:If you need a DECT repeater in your network, you can use FRITZ!DECT Repeater 100 together with the LED light. However, the LED light must be in the reception area of the base station.

  1. Click "Telephony" in the user interface of the DECT base station.
  2. Click "DECT" in the "Telephony" menu.
  3. Click on the "Monitor" tab.
  4. Click the entry for the respective the repeater.
  5. Click the (Delete) button.

2 Disabling "Reduce DECT field strength"

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "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.

3 Disabling "DECT Eco"

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

4 Enabling encryption

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "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").

5 Setting a PIN

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

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

6 Re-registering the LED light

Loading the factory settings of the LED light

  1. Use the light switch to turn off the LED bulb for 5 seconds.
  2. Use the light switch to turn off the LED bulb for 1 second.
  3. Repeat both of these steps 4 more times.
    Loading the factory settings of FRITZ!DECT 500
  4. Turn the lamp off and then on again.
  5. When the LED light flashes green and then glows red, the factory settings have finished loading and this shows that the LED light is ready to be registered with the FRITZ!Box.

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. Switch off the lamp that you screwed FRITZ!DECT 500 into and wait a few seconds.
  2. Switch on the lamp again. FRITZ!DECT 500 glows red and shows that it is ready to be registered with the FRITZ!Box.
  3. Push the DECT button on the FRITZ!Box within 2 minutes. Hold down the button for at least 6 seconds until the DECT or Info LED on the FRITZ!Box starts to flash. The FRITZ!Box is in registration mode as long as the LED flashes.

The LED light flashes green twice and then glows white once the DECT connection has been established.

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