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Bard part number 8201-038 is a pilot duty relay used in Bard wall mounted air conditioner and heat pump control circuits to switch low current signals that command other components to run. When a relay has worn or pitted contacts, you can see intermittent operation like fans or compressors not pulling in consistently, nuisance lockouts, or controls that act unpredictable, and replacing the relay with the correct Bard OEM part helps restore dependable switching and proper sequencing. Because pilot relays can look similar across models, confirm the part number against your unit model and wiring diagram before ordering to ensure correct coil voltage and contact arrangement for your application.