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Bard part 8406-024 is an OEM pressure switch (C6052B1039) used to prove proper air pressure and safe operation in select Bard HVAC equipment. When this switch senses the correct pressure level, it allows the unit to run; if the required pressure is not present, it helps prevent nuisance operation and protects key components by interrupting the control circuit. Replacing a weak or inconsistent pressure switch can resolve intermittent shutdowns and pressure related lockouts, but correct diagnosis is important since venting, tubing, and inducer or blower issues can cause the same symptoms. Confirm fit by matching the part number 8406-024 to your unit model and the Bard parts list before ordering.