Troubleshooting
---------------

Putting the HEIFU® to work is a simple task. However sometimes, for some reason, it may not work as expected.
If this is the case, please take a look at the most frequent causes of failure and check if this helps you getting the HEIFU® up and running. If not, please contact Beyond Vision’s technical support using the contacts listed in chapter :ref:`HEIFU®`.

+---------------------------+-------------------------------+-----------------------------------------+
| Symptoms                  | Probable Cause                | Resolution                              |
+===========================+===============================+=========================================+
| 1. The drone won't start. | There is no power.            | 1.1. Check if the battery is inserted;  |
| There are no lights on.   |                               |                                         |
|                           |                               | 1.2. Remove and re-insert the battery,  |
|                           |                               |                                         |  
|                           |                               | ensuring that you hear the click of     |
|                           |                               |                                         |
|                           |                               | the clips locking the battery package;  |
|                           |                               |                                         |
|                           |                               | 1.3. Press the ON/OFF button for more   |
|                           |                               |                                         |
|                           |                               | than one second.                        |
|                           |                               |                                         |
|                           |                               | 1.4. Check if you have a battery with   |
|                           |                               |                                         |
|                           |                               | enough charge (you can use the battery  |
|                           |                               |                                         |
|                           |                               | charger for this purpose).              |
+---------------------------+-------------------------------+-----------------------------------------+
| 2. The drone powers up,   | The drone doesn't fulfill     |  2.1 Check there criteria on the        |
| but it refuses to arm.    |                               |                                         |
|                           | the arm criteria demanded     |  :ref:`Before flight checklist` and     |
|                           |                               |                                         |
|                           | by the flight controller.     |  confirm that everything is in order.   |
+---------------------------+-------------------------------+-----------------------------------------+
| 3. I can't see my drone on| Communications failure.       | 3.1 Check if you are within the range   |
| beXStream® platform or    |                               |                                         |
| the drone information is  |                               | range of the communications device      |
| not updated in real-time  |                               |                                         |
| in the platform.          |                               | installed on the drone.                 |
|                           |                               |                                         |
|                           |                               | 3.2 If you are using mobile networks,   |
|                           |                               |                                         |
|                           |                               | check if the area where the drone       |
|                           |                               |                                         |
|                           |                               | stands is covered by the operator       |
|                           |                               |                                         |
|                           |                               | you are using.                          |
|                           |                               |                                         |
|                           |                               | 3.3. Check if there was a               |
|                           |                               |                                         |
|                           |                               | communications failure by your          |
|                           |                               |                                         |
|                           |                               | operator (e.g. by using your cell phone)|
|                           |                               |                                         |
|                           |                               | (e.g. by using your cell phone).        |
+---------------------------+-------------------------------+-----------------------------------------+
| 4. One or more rotors are | Mechanical or power supply    | 4.1. Check if the rotors are rotating   |
| presenting an abnormal    |                               |                                         |
| behavior.                 | problem.                      | freely without any prison.              |
|                           |                               |                                         |
|                           |                               | 4.2. Check if the the power supply and  |
|                           |                               |                                         |
|                           |                               | signal connectors to the arms are well  |
|                           |                               |                                         |
|                           |                               | fit.                                    |
+---------------------------+-------------------------------+-----------------------------------------+
| 5. I can't access         | Connection Issues             | 5.1. Check if you have internet access. |
| beXStream®.               |                               |                                         |
|                           |                               | 5.2. Check if your internet provider/PC |
|                           |                               |                                         |
|                           |                               | is not blocking the access to the       |
|                           |                               |                                         |
|                           |                               | website.                                |
|                           |                               |                                         |
|                           |                               | 5.3. Contact Beyond Vision in case of   |
|                           |                               |                                         |
|                           |                               | 503 or 404 errors show up on your       |
|                           |                               |                                         |
|                           |                               | browser when trying to access           |
|                           |                               |                                         |
|                           |                               | beXStream®.                             |
+---------------------------+-------------------------------+-----------------------------------------+