Go to the web portal and check for a sensor stream.

For V4 devices go to:

Manage > Devices > Open the device > Configuration > View Live Stream
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For all other devices go to:
​Manage > Devices > Open the device > Configuration > Alert Zones

Toggle through each video stream to confirm you can see an image of what the camera sees.

Check cables for damage - visually inspect all sensor cabling. Ensure cable insulation is in tact, and there are no kinks or bends at any point of the cable. Minimum bend radius is 50mm.

Check all connections - ensure all sensor connectors are properly seated and tight.
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Disconnect and reconnect sensors for good measure.

Check that there are fast flashing green lights for all sensors connected to the switch.

If you see one that is not fast flashing, double check it's power connection and try switching to a different port. If it doesn't fast flash in a new port replace sensor.
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Turning the ignition or vehicle key off and then on again quickly will reboot the sensors only.

Reboot the entire system BPU by disconnecting power. Wait for the device to safely shutdown (~60 seconds) before powering up again.

If the light remains red after doing this, contact Presien support.