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Bard part number 5651-166 is an OEM oil furnace blower control used to manage blower operation in Bard oil furnace applications by sequencing blower on and off operation based on the furnace’s call for heat and control inputs, helping restore proper airflow and safe, consistent heat delivery when a failed or erratic control causes no-blower, continuous-blower, or improper timing symptoms. As a genuine Bard replacement part, 5651-166 is intended to match the original electrical fit and function in compatible Bard oil furnace models, so you can replace the control with confidence after confirming the exact part number and furnace model compatibility before ordering.