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The 10123537 is a genuine OEM manual-reset high-limit switch (gray body) for the Goodman/Amana AMVC950905DXAE gas furnace. This normally-closed thermal safety switch opens the ignition circuit if it senses an over-temperature or flame-rollout condition, shutting the furnace down before heat can damage the heat exchanger or reach the burner box. Because it is a manual reset, it must be physically pressed to restore operation — a deliberate design that flags a serious airflow or combustion fault for a technician to investigate.
The OEM switch trips at Goodman's exact factory-calibrated cutout temperature, so your furnace's safety margin matches its design spec. Generic switches often carry a different trip point, which can cause nuisance lockouts or, worse, fail to protect the heat exchanger. On a safety-critical part, always use OEM.
Difficulty: Moderate (2/5). Cut power, note the wire positions, unfasten the two mounting screws, and transfer the spade connectors to the new switch. Correct orientation on the heat exchanger or burner box matters — about 20 minutes. If the old switch tripped, diagnose the root cause (blocked filter, failed blower, or cracked heat exchanger) before returning the unit to service.