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The Goodman 20171701 condensate drain trap manages the acidic condensate produced by the WFD195070S4CAA high-efficiency gas furnace. The trap maintains a water seal that lets condensate drain while blocking flue-gas backflow, which is essential for correct pressure-switch operation. A cracked or clogged trap is a leading cause of water leaks, pressure-switch faults, and furnace lockouts.
The OEM 20171701 is molded with the exact port sizes and geometry needed to interface with this furnace's drain and pressure-switch tubing. Generic traps often require adapters and may not hold a reliable seal. For proper drainage and pressure-switch performance, OEM is recommended.
Moderate (2/5) — Disconnect the condensate tubing, remove and replace the trap, then reconnect and check for leaks. Clean or prime the trap with water on install. Shut off gas and power first; consult a technician if unsure.