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The Goodman 20197311 is a genuine OEM negative-pressure (draft-proving) switch calibrated to -0.60 inches water column and wired normally open, designed for the GCH90904CXAA gas furnace. The switch confirms that the induced-draft blower is pulling proper venting airflow before the control board allows ignition. If it never closes, the furnace won't fire; if it fails closed, it defeats a critical combustion-safety interlock.
Pressure-switch setpoints are model- and vent-configuration specific — a switch with the wrong "WC" rating will either nuisance-trip or fail to prove draft safely. The genuine Goodman OEM 20197311 is factory-set to -0.60" WC, guaranteeing correct sequencing. For a combustion-safety component, always choose OEM.
Easy — usually one or two spade terminals, a single mounting screw, and a rubber sensing hose. Disconnect power first, and verify the hose is seated and free of condensate for reliable operation.