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The Goodman 20171701 condensate drain trap is a genuine OEM assembly for the Goodman/Amana AMV90905DXAB 90%+ condensing gas furnace. In a high-efficiency furnace, combustion produces acidic condensate that must drain freely while maintaining a water seal that blocks flue gases from bypassing the pressure switch. A cracked or clogged trap is a leading cause of pressure-switch lockouts, water leaks, and intermittent no-heat calls.
OEM Goodman traps match the factory port layout and internal baffle geometry, ensuring the pressure-switch tap reads correctly. Generic traps are cheaper but often require adapter fittings and may not seat cleanly against the collector box.
Moderate (2/5) — Involves disconnecting condensate hoses and the collector-box connection; flush new tubing and prime the trap with water before restart. Power and gas off first.