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Bard part number 8551-010 is an OEM start capacitor rated 189-227 MFD at 330V, used in motor starting circuits to give the compressor or fan motor the extra starting torque needed to get up to speed smoothly. When a Bard wall mount unit struggles to start, trips on startup, or hums before the motor turns, a weak start capacitor is a common cause, and replacing it with the correct Bard-specified capacitance and voltage helps restore reliable starts and reduce stress on the motor and contactor. Match the microfarad range and voltage exactly, confirm your unit model and wiring against the Bard documentation, and have a qualified technician handle installation and safe discharge procedures.