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The genuine OEM Goodman 11112501S air pressure switch is a factory-calibrated safety control for the WGGE4336A070MAB furnace. It confirms proper draft/venting before the furnace allows ignition. Rated at -0.33 inches of water column (WC) and configured normally open (NO), the switch closes when the inducer establishes adequate airflow, then permits the ignition sequence to proceed. If venting is blocked, it keeps the burner from firing, protecting against unsafe operation.
Pressure switch setpoints are safety-critical. The OEM 11112501S is calibrated to the furnace's exact draft requirement, so it trips at the correct pressure. A generic switch with a different setpoint can cause nuisance lockouts or, worse, allow firing under poor venting. Use the genuine part for safe, reliable operation.
Easy to Moderate — Usually two mounting screws, one hose connection, and two wire terminals. Verify tubing is clear and reconnect correctly. Disconnect power before servicing; test operation after replacement.