The pitot probe is the sensor used by the eBee X to calculate airspeed, wind and altitude. It must be kept clean and clear of obstructions to function properly.
Often times, when operating an eBee X, you will encounter dirt, dust or excessive humidity which can affect the unit's airspeed sensor. As such it will need to be replaced. Here's a link to a video that outlines procedure.
You can also refer to the eBee X manual on Pg 83-84. If you any other questions, feel free to reach out with one of CartoCanada's support agents by starting a chat utilizing the chat button on the bottom right on your browser or email us at email@example.com.