Bard 9043-143 - Pressure switch 0.39

The Bard 9043-143 pressure switch is an OEM safety and proving control used in Bard HVAC equipment to verify proper airflow or draft before allowing the unit to operate. Rated at 0.39, this switch helps protect the system by opening or closing its contacts based on the correct pressure signal, which supports reliable ignition and run permission logic on compatible Bard wall mount and packaged units. If you are troubleshooting nuisance lockouts, intermittent operation, or a unit that will not prove, replacing a weak or out of calibration switch like 9043-143 can restore proper safety sequencing when the rest of the venting, hoses, and inducer or blower components check out. Reference marking 2078091 is commonly associated with this switch, but always confirm your model and serial number match the required pressure rating and electrical terminals before ordering.

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