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This genuine OEM Goodman condensate drain trap (part #20171701) is a direct-fit replacement for the Goodman GCH950904CXAB high-efficiency gas furnace. The trap collects acidic condensate produced by the secondary heat exchanger and inducer, routing it to the drain while maintaining a water seal that blocks flue gases from escaping into the cabinet or living space.
Over time, drain traps clog with scale and biofilm or crack from thermal stress, causing water leaks, pressure-switch faults, and no-heat lockouts. Replacing the trap restores proper drainage and a safe flue-gas seal.
The OEM Goodman drain trap matches the exact port layout, pressure-switch tap, and mounting of the original assembly — critical because the trap ties into the furnace's safety pressure circuit. Generic traps often require adapters and may not align the pressure port correctly. OEM is strongly recommended.
Moderate (3/5). Power down the furnace, disconnect drain and pressure-switch tubing, remove the old trap, and install the new one — priming it with water before restart. Expect 30–45 minutes and keep a towel handy for residual condensate.