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The Goodman 20197308 Pressure Switch is a genuine OEM draft-proving air pressure switch rated at -0.10" WC (normally open) for the GME950403BXAB 96% AFUE gas furnace and compatible Goodman/Amana models. This switch confirms the induced-draft blower is producing adequate negative pressure before the control board allows ignition. If the correct vacuum is present, the normally-open contacts close and the sequence proceeds; if venting is blocked or the trap/inducer is failing, the switch stays open and the furnace safely refuses to fire.
OEM vs. Generic: The OEM 20197308 is calibrated to the exact -0.10" WC trip point and NO configuration this furnace requires. A generic switch with a different set point or normally-closed action can allow ignition under poor-draft conditions or cause chronic no-heat lockouts. For a code-critical safety device, genuine Goodman OEM is strongly recommended.
Install difficulty: Easy (1–2 of 5). Disconnect power, pull the rubber hose off the pressure tap, unplug the spade terminals, remove the mounting screw(s), and install the new switch — reattaching the hose without kinks. A manometer verifies the switch is seeing proper draft. Rule out a blocked flue or clogged trap before replacing.