Troubleshooting the balenaFin


When using a balenaCloud provisioned device, if the balenaFin does not appear in the balenaCloud dashboard upon powering the device on, you may want to check the list below for potential issues.

  • Check that the balenaOS image flashed to the Fin has the correct SSID and password for your WLAN network

    • A pattern of 4-blinks on the ACT status LED indicates that the Fin cannot connect to a network
  • Ensure that the WLAN radio physical switch (mapping 33) is set to the OFF position if you are not using an external antenna
  • Verify that the power supply can maintain a minimum of 6 V (ideally 1.5 A or above) when powering the device from the Phoenix (mapping 23) or Barrel Adapters (mapping 24)

    • If USB1 ON and USB2 ON Status LEDs (mapping 18 & 23) are not turned ON, it is an indicator that the power supply may be insufficient for powering the Fin
    • The board may still power on if a low current or voltage is supplied, however the peripherals such as the Ethernet may not function correctly.


I cannot see any wireless interface listed, and WiFi doesn't work

Please make sure you have the balena-fin device tree overlay set in your config.txt file (dtoverlay=balena-fin).

Why is my WiFi signal so weak?

There is a hardware switch on balenaFin that enables you to switch between the on-board and an external WiFi antenna - OFF for internal/on-board, ON for external.

I have a HAT which works on a Raspberry Pi 3 but does not work on balenaFin, or my Raspberry Pi display or camera don't work

Please make sure you have the balenaFin dt-blob.bin in the root of the boot partition (this in case of camera+display mode, this in case of dual camera mode)

balenaFin is heating a lot whilst running my appplication

If your application carries out intensive processing on the GPU, we highly recommend the use of the Raspberry Pi Compute Module 3+ Lite (CM3+L) over the older version, as it has much improved thermal performance. If you're using the Raspberry Pi Compute Module 3 Lite (CM3L/CM3+L) we suggest adding a heatsink to the system-on-chip on the CM3L/CM3+L. The heatsinks available for the Raspberry Pi 3 model B are compatible, depending on your device enclosure.

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