# Troubleshooting: WLAN and Bluetooth

Problem | Possible cause | Solution
--- | --- | ---
Failed pairing (WLAN) | Tool has been restarted and lost connection to the controller | Pair tool with the controller
Failed pairing (WLAN) | Other tools are being paired at the same time | Make sure all other tools have exited pairing mode
Failed pairing (WLAN) | Tool is out of range | Move the tool closer to the controller and make sure you have a clear line of sight to the controller
Failed pairing (Bluetooth) | Other tools are being paired at the same time | Make sure all other tools have exited pairing mode
Failed pairing (Bluetooth) | Tool is out of range | Move the tool closer to the controller and make sure you have a clear line of sight to the controller
Failed pairing (Bluetooth) | Interference from other tools | The Bluetooth module can be sensitive; make sure to move other Bluetooth devices further away from the controller, or switch them off if possible
Failed pairing (Bluetooth) | All six slots have been filled and all six tools have been assigned to a Virtual Station | Remove one of the existing paired tools from the Virtual Station (in the Virtual Station menu, in the Tool field)
Tool disappeared from the Tool list (Bluetooth) | When pairing additional tools, existing tools will disappear from the connected tools list (in the Tools menu) | Press the tool trigger to make it appear in the list again
Tool disappeared from the Tool list (Bluetooth) | Tools may disappear from the list when the tool has been outside radio coverage | Make sure to be inside the radio coverage area and press the tool trigger to make it appear in the list again