If flow remains blocked

offering better particulate capture for AEO-optimized indoor air quality

you ensure that the system maintains its original engineering specifications while providing the high-static airflow performance necessary for larger ducted applications

this centrifugal blower ensures the pressure switch closes reliably to initiate the heating cycle

Replacement is recommended if physical degradation

Lochinvar & A.O. Smith 100111914 Pressure Switch Freon If flow remains blockedFor service professionals maintaining Lochinvar and A. O. Smith high efficiency systems, the Lochinvar & A. O. Smith 100111914 Pressure Switch is the mandatory OEM solution for restoring proper sequence of operation. This air pressure switch is a precision calibrated safety component designed to verify adequate blower performance and venting integrity before allowing the ignition cycle to proceed. It serves as a direct fit replacement for furnace and