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The Bard 8201-117 start relay is an OEM electrical component used in Bard wall mounted air conditioners and heat pumps to help the compressor start properly by switching the start circuit during startup. When a start relay is weak or failing, symptoms often include hard starting, nuisance trips, or intermittent no cool calls even though the rest of the unit appears normal. Replacing with the correct Bard part helps restore reliable compressor engagement and reduces unnecessary stress on the compressor and electrical components. Match this relay to your unit model and wiring diagram to confirm correct application and terminal configuration before installation.