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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM safety control engineered for the WGFM195090S4CAD gas furnace and compatible Goodman/Amana models. This high-temperature limit switch protects your furnace by interrupting the circuit when unsafe heat levels are detected — for example, during a blocked flue, failed inducer, or restricted airflow condition. Because it is a manual-reset design, it will not auto-cycle after a fault, forcing a deliberate inspection before the furnace can restart. That is exactly the behavior a properly designed safety limit should have.
This is the genuine OEM Goodman part, built to the original trip-temperature and reset spec — no guesswork on set points. Generic aftermarket switches may look similar but frequently trip early, trip late, or fail to reset reliably, all of which cause nuisance lockouts or, worse, compromised safety. For a life-safety component like a limit switch, the OEM part is the right call.
Easy (2/5) — Turn off power at the furnace disconnect, photograph the wiring, remove the two spade connectors, unscrew the switch, and reverse the process with the replacement. Most homeowners with basic tools can complete it in under 15 minutes. If your limit keeps tripping after replacement, have a licensed HVAC technician diagnose the underlying airflow or combustion issue.