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Bard part number 8620-188 is an OEM GSVS EM heat relay replacement kit used in Bard GSVS series geothermal heat pump applications to restore proper operation of the emergency heat circuit when the original relay or relay assembly is worn, sticking, or electrically compromised. As a genuine Bard electrical control service kit, it is intended to maintain correct heater staging and reliable call-for-heat response while keeping the unit wiring and control logic aligned with Bard specifications. Confirm compatibility by matching your unit model and serial information to the correct service literature before ordering, since relay kits are applied by specific control configurations within the GSVS EM system family.