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The 10123529 is a genuine OEM manual reset high-limit switch for the Goodman WGFD28070V3BXAA gas furnace. This safety control opens the heating circuit if the furnace overheats — typically from restricted airflow, a dirty filter, or blower failure — protecting the heat exchanger and cabinet. Because it's a manual reset style, it must be pressed to restore operation after a trip, alerting the homeowner or technician that an overheat event occurred.
The genuine Goodman OEM switch is calibrated to the exact trip temperature the furnace was engineered for. A generic switch with the wrong cut-out setpoint may nuisance-trip during normal operation or, worse, fail to open when it should. For a safety-rated control, always match the OEM part.
Easy. Disconnect power, note and transfer the two spade wire connectors, unscrew the old switch from its bracket, and mount the replacement in the same orientation. Press the reset button after wiring. Estimated time: 10–15 minutes. If the switch keeps tripping after replacement, diagnose the underlying airflow or combustion issue.