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The Goodman 20171701 is a genuine OEM condensate drain trap built for the GCH90904CXAA 90%+ high-efficiency gas furnace. On condensing furnaces, the trap holds a water seal that lets acidic condensate drain freely while blocking flue gases from escaping into the cabinet. A cracked, clogged, or algae-fouled trap is a leading cause of pressure-switch lockouts, water leaks around the furnace base, and nuisance no-heat calls.
The port layout, seal height, and fitting sizes on this trap are specific to the GCH90904CXAA drainage system. The genuine Goodman OEM trap mates directly to the factory hoses and inducer drain ports — generic traps often require adapters that create leak points. OEM ensures a proper seal and correct pressure-switch reference.
Moderate — involves disconnecting drain hoses, clearing the old trap, and priming the new trap with water before startup. Confirm all hose connections are tight and the trap is filled to establish the water seal.