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Bard part 9022-054 is an OEM cad cell flame sensor used with a Honeywell oil primary control to prove burner flame and keep the unit running safely. A weak or dirty cad cell can cause nuisance lockouts, intermittent burner shutdowns, or failure to start, so replacing it with the correct Bard-specified sensor helps restore reliable flame detection and proper safety operation. This component is typically used in Bard oil-fired equipment applications, and matching the part number to your unit model and control setup is the best way to confirm proper fit before ordering.