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The Goodman 20197311 Pressure Switch is a genuine OEM safety component engineered for the GCH91155DXAE gas furnace and compatible Goodman/Amana models. This normally-open (N.O.) switch is calibrated to close at a set point of -0.60" water column (WC), proving adequate combustion-air and vent draft before the ignition sequence is allowed to proceed. A failing pressure switch is one of the most common causes of a furnace that ignites briefly then shuts down, or that fails to light at all.
OEM vs. Generic: Our genuine OEM 20197311 switch is factory-calibrated to the exact -0.60" WC trip point Goodman specifies for this cabinet. Generic switches often carry looser tolerances that can cause nuisance lockouts or, worse, allow ignition under poor-draft conditions. For a safety device, matching the OEM calibration is strongly recommended.
Install difficulty: Easy (1/5). Replacement typically takes 10–15 minutes: power down the furnace, disconnect the two spade terminals and the rubber pressure tube, unscrew the mounting screws, and reverse for the new switch. No special tools required. Always confirm power is off at the breaker before servicing.