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The Goodman 20197310 Pressure Switch is a genuine OEM air-proving switch rated at -.60" WC (normally open) for the WGFM195090S4CAC gas furnace. It confirms that the induced-draft blower is moving combustion air and that the venting is clear before allowing ignition. If the switch does not close, the furnace safely refuses to fire — protecting against blocked flue, condensate backup, or inducer failure.
OEM vs. Generic: The genuine 20197310 is factory-calibrated to the exact -.60" WC trip point and hose-port layout this furnace expects. Generic switches with a different set point cause false lockouts (won't fire) or, worse, allow firing under unsafe draft conditions. As a combustion-safety component, the OEM-calibrated switch is the correct, reliable choice.
Installation difficulty: Moderate. With power and gas off, transfer the sensing hose and wiring to the new switch, mount it in the same position, and confirm the hose is unrestricted and free of condensate. After install, verify the switch closes on a call for heat. Professional verification of draft pressure is recommended. Confirm the -.60" WC rating matches your furnace before ordering.