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The Goodman 20171701 is a genuine OEM condensate drain trap for the AMH950904CXAB high-efficiency gas furnace. In a condensing furnace, the secondary heat exchanger produces acidic condensate that must drain away continuously while maintaining the pressure separation the induced-draft system depends on. This factory trap holds a water seal that lets condensate flow out while preventing flue gases from escaping the drain path and keeping air from disrupting the pressure switch. It is designed for the AMH950904CXAB and other compatible Goodman and Amana 90%+ AFUE furnaces.
The OEM trap matches the furnace's exact port locations, internal volume, and seal height, so it drains correctly and keeps the pressure switch stable. Generic traps can differ in port spacing or seal depth, causing water backup, pressure-switch faults, and lockouts. For a condensing furnace, the factory-designed trap is the reliable path.
Moderate (2 of 5). Power off the furnace, disconnect the inlet and outlet tubing and any pressure-switch hose, remove the old trap, and mount the new one in the correct orientation. Prime it with water, reconnect the lines, and verify there are no leaks and that the furnace completes a full heat cycle without a pressure fault.