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The Goodman 20197308 is an OEM negative-air-pressure switch for the AMVC950905DXBA variable-speed, 96% AFUE furnace. As a normally-open draft-proving switch with a -0.10" WC setpoint, it confirms adequate inducer draft on the low-fire / low-pressure stage before the control board permits ignition. In a two-stage condensing furnace, multiple pressure switches monitor different draft thresholds — this lower-setpoint switch guards the first-stage firing rate.
This switch trips at a precise -0.10" WC to match the furnace's low-fire draft. Substituting a switch with a different setpoint can cause the burner to skip stages, short-cycle, or ignite without proper draft. OEM calibration is essential for safe, reliable staging.
Easy–Moderate (2/5) — cut power, move the spade terminals and sensing hose to the new switch, and mount it. Inspect the tubing for cracks and verify normal ignition on restart.