The Amana-Goodman 0131F00435S Dual Pressure Switch is an OEM HVAC safety component designed for compatible two-stage gas furnaces. It monitors the negative air pressure generated by the inducer motor to verify proper airflow and venting conditions before allowing the furnace ignition sequence to proceed. By helping prevent operation under unsafe venting conditions, this switch support... https://www.partshnc.com/amana-goodman-0131f00435s-dual-pressure-switch