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The Goodman 10123533 is a genuine OEM manual-reset high-limit switch for the GMH950453BXAA gas furnace. This safety control opens the gas circuit if the heat exchanger exceeds its rated temperature — protecting against overheating from restricted airflow, a failed blower, or a dirty filter. Because it is a manual reset device, it must be pressed to restore operation, alerting the technician that an over-temperature event occurred.
The OEM 10123533 is calibrated to Goodman's exact trip temperature for this heat exchanger. Installing a generic switch with a different setpoint can cause nuisance trips or, worse, fail to protect the exchanger — the genuine part guarantees the correct cutout point.
Easy — Shut off power, remove two mounting screws, transfer the wire leads, and mount the new switch flush to the heat exchanger. If it trips again after reset, diagnose the underlying airflow problem before running.