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There should be a clearly visible red beam of light when the reader is scanning for barcodes. If there is no beam, make sure the device is plugged in correctly and powered on.

Since the barcode reader is an optical device, it can be obstructed by dust and other particles. Check first that there is nothing blocking the reader beam. You can clean the reader lens and mirrors by swiping them with a clean cloth.

Barcode readers mounted under the device typically gather more dust and should be cleaned regularly.

If the barcodes are still not working, check with a few different samples. Barcodes can become more difficult to read over time as they wear out and wrinkle, so check whether all barcodes are not working or just some, before contacting Supa support.