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The Goodman 20171701 Drain Trap is a genuine OEM condensate trap built for the ACV90905DXBA high-efficiency gas furnace and compatible Goodman/Amana models. The trap collects acidic condensate from the secondary heat exchanger and routes it to the drain while maintaining a water seal that blocks flue gases from escaping into the cabinet. A cracked, clogged, or missing trap triggers pressure-switch faults, water leaks, and intermittent furnace lockouts.
The OEM trap matches the exact port spacing, height, and internal baffle design so the water seal and pressure-switch readings stay within spec. Generic or universal traps frequently require adapters and can throw false pressure-switch errors. For reliable operation on a condensing furnace, OEM fit matters.
Moderate (2/5). Power down the furnace, disconnect the inlet/outlet drain hoses, remove mounting screws, and install the new trap — then prime it with water before restarting. Inspect hoses for clogs while access is open. Allow 20–30 minutes.