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The Goodman 20197308 Pressure Switch is a genuine OEM normally-open (NO) draft-proving control for the Amana AMVC950704CXAC gas furnace. Rated at a -.10 in WC set point, it closes once the inducer establishes proper draft, signaling the control board that it is safe to proceed with ignition.
Because this switch enforces a safety interlock, the -.10 in calibration must be exact. This OEM unit is factory-set to Goodman's specification and uses the correct terminal and port configuration. Generic replacements risk nuisance lockouts or unsafe operation, so OEM is recommended.
Difficulty: Moderate (2/5). Disconnect the hose and spade terminals, mount the new switch in the same orientation, and reconnect. Shut off gas and power before servicing; verify operation on startup.