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The Goodman 20197308 Air Pressure Switch is a genuine OEM safety control for the GMH950905CXAB high-efficiency gas furnace. Rated at -0.10 in. w.c., normally open (NO), this switch verifies that the inducer draft motor is pulling proper airflow before the furnace allows ignition. If venting is blocked or the inducer underperforms, the switch keeps its contacts open and prevents burner operation — a critical protection against carbon-monoxide risk.
Pressure switches are calibrated to a specific setpoint and contact type. Installing a generic switch with the wrong rating can cause false lockouts or, worse, allow the furnace to fire without adequate draft. This OEM Goodman switch is factory-matched to your furnace's design draft pressure for safe, code-compliant operation.
Easy–Moderate (2 of 5). Typically a 20–30 minute job: cut power, transfer the pressure hose and two spade terminals to the new switch, and remount. Confirm the printed setpoint matches -0.10" NO before installing, and test-fire the unit afterward.