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Bard part number 8201-037 is an OEM impedance relay with an SPDT contact set rated 3A and a 24V coil, used to let the low voltage control circuit safely switch a higher load inside Bard wall-mounted HVAC equipment. When this relay starts to fail, you may see intermittent operation such as loads not pulling in consistently or control signals present without the expected equipment response. Replacing the relay with the correct Bard 8201-037 helps restore dependable switching, proper sequence of operation, and factory-correct fit in the control compartment. Because 8201-037 is shown online as obsolete or replaced, confirm the approved superseding part number for your exact model and serial before ordering.