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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/Mobile 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/Mobile 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 latest FRITZ!OS for the FRITZ!Box.

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 on 'System' in the FRITZ!Box user interface.
  2. Click on 'Event Log' in the 'System' menu and then 'Internet Connection'.
  3. 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. Remove the router bracket from the FRITZ!Box and pick up the FRITZ!Box so you are facing the underside of the device.
  2. Press the SIM card briefly to remove it from the SIM card slot.
  3. Check whether it is the nano-SIM (12.3 x 8.8 x 0.67 mm) SIM card you received from your mobile network provider and that the contacts are not damaged.
    • If it is not the 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 nano-SIM card you received from your mobile network provider and the contacts on it are not damaged:
    1. Insert the nano-SIM card into the SIM card slot with the slanted edge of the card on the left and the contacts facing downwards.
    2. Push the SIM card gently into the SIM card slot until it clicks into place. A few millimetres 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 on 'Internet' in the FRITZ!Box user interface.
  2. Click on '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 on 'Apply' to save the settings.

Selecting the type of mobile network

Depending on your mobile network provider and contract, if there are several radio cells at your location, you may need to manually select the desired type of the mobile network in the FRITZ!Box:

  1. Click on 'Internet' in the FRITZ!Box user interface.
  2. Click on 'Account Information' in the 'Internet' menu.
  3. In the section 'Type of Mobile Network', enable the option 'Manual' and disable the options '3G (UMTS / HSPA+)' and '4G (LTE)'.
  4. Click on 'Apply' to save the settings.
  5. If you are now no longer able to connect to the mobile network, re-enable the options '4G (LTE)' and '3G (UMTS / HSPA+)' after each other and use the type of mobile network with which the FRITZ!Box achieves the highest throughput.

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 on 'Internet' in the FRITZ!Box user interface.
  2. Click on 'LTE Information' in the 'Internet' menu.
  3. Click on the 'Reception' tab.
  4. Click on the 'Start Alignment Aid' button.
    • Now the current signal strength of the antennas is displayed by the LEDs on the FRITZ!Box and in the user interface.
  5. Select a location for the FRITZ!Box where the signal strength is as high as possible.
  6. If you are using the FRITZ!Box indoors, note the following when positioning it:
    1. Place the FRITZ!Box as close to an outside wall as possible or attach it to the inside of a window. If you know where your provider's radio cell is located, position the FRITZ!Box by the outside wall facing the radio cell.
    2. Select a location for the FRITZ!Box that is free from obstacles, sources of interference, and heat that is about one metre above the ground.
    3. Do not set up the FRITZ!Box in the corner of a room.
  7. If you are using the FRITZ!Box outdoors, note the following when positioning it:
    1. Use the router bracket for outdoors to attach the FRITZ!Box to an outer wall (for example in the window reveal) or attach it from outside to a window.
    2. Mount the FRITZ!Box at a location that is about one metre from the ground that is protected from lightning, strong wind, and from unauthorized access.
    3. Do not mount the FRITZ!Box in places where people could be injured, for instance, by the device falling down.
    4. Do not expose the FRITZ!Box to direct streams of water and do not mount it on the weather side of the house.
    5. If you mount the FRITZ!Box on a window or a window reveal, make sure that the window weep holes are clear and that the window seals are suitable for mounting. No moisture may enter the power adapter via the cable.

      Note:The FRITZ!Box is dust and splash-protected according to protection class IP54 and suitable for use in protected outdoor areas.

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