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Knowledge document #55

The FRITZ!Box's Power LED flashes

The FRITZ!Box's Power LED flashes? ✔ Here you can find out what this means and how to solve the problem.

Your FRITZ!Box establishes a connection to the mobile network as soon as you insert your SIM card and enter the PIN in the FRITZ!Box user interface. This can take up to 2 minutes. During this time, the Power LED on the FRITZ!Box flashes and then stays lit as soon as the connection has been established.

This guide shows you how to resolve the following error:

  • The FRITZ!Box's Power LED flashes continuously and you cannot connect to the internet.

One or several of the following error messages may be displayed in the event log of the FRITZ!Box:

  • "No LTE network was found within range."
  • "Could not establish LTE connection.
    Reason: EPS_SERVICES_NOT_ALLOWED_IN_THIS_PLMN"

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 FRITZ!Box 6820 LTE v2, v3, and v4 with the latest FRITZ!OS, the FRITZ!Box 6820 LTE v1 may differ.

1 Issue occurred after updating FRITZ!OS

Only follow the instructions in the following guide if the error occurred immediately after a FRITZ!OS update:

  1. Since updating FRITZ!OS, the FRITZ!Box's Power LED flashes

2 Checking the event log of the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Event Log" in the "System" menu.
  3. Select "Internet Connection" from the drop-down list.
  4. If the FRITZ!Box indicates that the mobile network connection is established temporarily and drops repeatedly, follow the steps in our guide FRITZ!Box reports that the mobile network connection drops frequently.

3 Checking your SIM card

Although it may not appear to be the case, your SIM card may have been inserted incorrectly, it may be damaged, or it may be the incorrect SIM card. Therefore, check the SIM card in the FRITZ!Box:

  1. Press the SIM card briefly to remove it from the SIM card slot.
  2. Check whether it is the mini-SIM (25 x 15 x 0.76 mm) SIM card you received from your mobile network provider and that the contacts are not damaged.

    Important:Do not use any micro or nano-SIM cards that have already been punched out and inserted into a SIM card tray because they can get jammed and damage the SIM slot.

    • If it is not the mini-SIM card you received from your mobile network provider or the contacts on the SIM card are damaged, contact your provider.
    • If it is the mini-SIM card you received from your mobile network provider and the contacts on it are not damaged:
    1. Pick up the FRITZ!Box so that you are facing the underside of the device and can read the "SIM Card" label on the SIM card slot.
    2. Insert the SIM card into the SIM card slot with the slanted edge of the card on the left and the contacts facing downwards.
    3. Push the SIM card gently into the SIM card slot until it clicks into place. A few millimeters of the SIM card protrude from the SIM card slot.
      Inserting the SIM card

4 Configuring the FRITZ!Box

Enabling roaming

The following step is only necessary if you are using the FRITZ!Box abroad (for example with a German SIM card in Italy) and your mobile network provider there uses a different provider's mobile network:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Enable the option "Permit roaming".

    ATTENTION!Enabling roaming could result in additional costs. Refer to your mobile network provider for information on roaming and possible costs.

  4. Click "Apply" to save the settings.

Selecting the frequency band

Depending on your mobile network provider, at individual locations you may need to select the frequency band in the FRITZ!Box manually:

Note:In Germany, the frequency bands 2.6 GHz, 1.8 GHz, and 800 MHz are used. Not all frequency bands are available at all locations, and not all mobile network providers support all frequency bands.

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. In the "LTE Frequency Band" section, enable the option "Manual" and disable all frequency bands except "2.6 GHz / band 7".
  4. Click "Apply" to save the settings.
  5. If the FRITZ!Box can establish a mobile network connection using the frequency band you selected:
    1. Click "Internet" and then "LTE Information".
    2. Click on the "Mobile" tab.
    3. Check which speed is displayed in the "Throughput" line.
  6. Repeat steps 2 - 5 with the frequency bands "1.8 GHz / band 3" and "800 MHz / band 20", and use the frequency band the FRITZ!Box can achieve the highest throughput with.

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

Installing the latest FRITZ!OS makes your FRITZ!Box compatible with the latest mobile network technology used by mobile network providers in their radio cells:

  1. Manually update FRITZ!OS.

6 Finding the ideal location for the FRITZ!Box

You can use the alignment aid to find the ideal location for the FRITZ!Box and the best position for the mobile network antennas:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "LTE Information" in the "Internet" menu.
  3. Click on the "Reception" tab.
  4. Click the "Start Alignment Aid" button.
    • Now the current signal strength of the antennas is displayed by the LEDs on the FRITZ!Box (in five levels) and in the user interface.
  5. Select a location for the FRITZ!Box where the signal strength is as high as possible. When doing so, note the following:
    1. Place the FRITZ!Box as close to an outside wall as possible. If you know where your provider's mobile radio cell is located, place the FRITZ!Box by the wall facing the mobile radio cell.

      Important:If you place the FRITZ!Box in the attic or on a window sill, make sure that the permissible operating temperature of 0° to 40° Celsius is not exceeded.

    2. Select a location for the FRITZ!Box that is free from obstacles, sources of interference, and heat that is about one meter above the ground.
    3. Do not set up the FRITZ!Box in the corner of a room.
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