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The Goodman 11177113 Combination Pressure Switch is a genuine OEM dual-stage draft-proving control for the AMVC950453BXBA modulating variable-speed gas furnace and compatible Goodman and Amana models. This single gray assembly houses two switches — set at -0.30" WC and -0.75" WC — that verify proper inducer draft at both low-fire and high-fire stages before the control board permits ignition. It protects against blocked flues, condensate blockage, and inducer failure by preventing the burners from firing without adequate venting.
Pressure-switch set points are furnace-specific and safety-critical. The OEM 11177113 is factory-calibrated to the exact -0.30"/-0.75" trip values your control board expects. A generic switch with different set points causes pressure-switch lockout codes or, dangerously, allows firing with poor draft. For a two-stage modulating furnace, use OEM.
Moderate (2/5) — Shut off power and gas. Label and transfer the hoses to the matching ports and move the wiring to the new switch, keeping tubing routing identical. Confirm hoses are free of condensate and cracks. After install, cycle the furnace and verify both stages prove draft correctly.