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The Goodman 20197308 is a genuine OEM negative-pressure air proving switch calibrated to -0.10 inches of water column for the AMH950905DXAE gas furnace. This normally-open (NO) switch confirms that the induced-draft blower is establishing proper venting before the control board allows ignition — a critical safety interlock that prevents the furnace from firing without adequate flue draft.
Pressure switches are safety devices, and setpoint accuracy is everything. This factory 20197308 is calibrated and stamped to the exact -0.10" WC threshold the AMH950905DXAE control logic expects. Generic switches with the wrong setpoint cause short cycling, lockouts, or — worse — allow firing under poor draft conditions. Always match OEM for proving switches.
Moderate — about 20–30 minutes. Shut off gas and power, note and transfer the hose(s) to the correct port, move the two spade terminals, and mount the switch. Verify correct hose routing and check for a clean draft before returning to service.