Fault Causes: Insufficient light emission from the source, damaged or dusty detector, misaligned or shifted optical path. Start by checking your calibration status. If your UV reading is drifting or results are inconsistent across runs, it's time to recalibrate using certified standards. Even if a spectrometer is properly maintained, wear and tear will mean that it may occasionally require troubleshooting to get it to work as expected. This guide outlines a structured approach to identifying, interpreting, and resolving common spectroscopic issues by linking visual symptoms. There are four separate flow charts for troubleshooting data review and data upload challenges.