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Bard part 9043-403 is an OEM 15 microfarad 370VAC motor run capacitor used in Bard wall-mounted and packaged HVAC equipment to help maintain proper motor operation and smooth, reliable running under load. When a run capacitor weakens, you may see hard starting, overheating, nuisance trips, or reduced airflow, so replacing it with the correct Bard-rated component helps restore normal electrical performance and protects the motor from added stress. Match the microfarad rating and voltage exactly to your unit data and wiring diagram, and confirm the terminal style and mounting space before installation to ensure proper fit and safe operation.