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The Goodman 20197312 Pressure Switch is a factory OEM combustion-safety control for the WGFM195070S3BAC gas furnace and compatible Goodman/Amana models. This normally-open switch proves adequate draft before the control board allows ignition, closing at a -0.37 in. WC set point when the inducer establishes proper negative pressure.
When a pressure switch drifts out of calibration or fails closed/open, the furnace throws draft-proving faults, fails to ignite, or lockouts intermittently. An exact-spec OEM replacement restores the correct trip point so the ignition sequence completes reliably.
Pressure-switch calibration is measured in hundredths of an inch of water column. Our genuine OEM Goodman switch ships at the factory -0.37" set point your control board is programmed to expect. Universal switches with adjustable or approximate ratings frequently cause false lockouts or, worse, mask a real venting problem. For a safety-critical part, OEM precision is essential.
Easy–Moderate (2.5/5). About 15 minutes: cut power, transfer the hose and two spade terminals, and mount the new switch in the original orientation. Verify the sensing hose is clear and free of condensate so the switch reads accurate pressure.