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• 8406-042 OBSOLETE

• Pressure Switch .28 W.C.

The Bard 8406-042 pressure switch is an OEM air-proving safety control used in Bard HVAC equipment to verify proper airflow and draft before allowing the unit to operate. Rated at 0.28 in. w.c., it helps protect the system by opening or closing its contacts when the correct pressure is not present, which can prevent nuisance lockouts and safeguard components when issues like restricted filters, blocked vents, or blower problems occur. If you are troubleshooting intermittent shutdowns, ignition enable problems, or airflow-related fault codes, replacing the pressure switch with the correct Bard 8406-042 part is a reliable way to restore factory-intended operation and fit.