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The Goodman 10123534 is a genuine OEM manual-reset high-limit safety switch used on Goodman and Amana gas furnaces such as the AMVC961005CNAA. This normally-closed thermal switch opens the control circuit if it senses an overtemperature condition (blocked flue, failed blower, or dirty filter) and must be manually reset once the fault is corrected — providing a positive safety lockout that protects the heat exchanger.
The genuine 10123534 is calibrated to the exact trip and reset temperatures specified by Goodman for this furnace platform. Because this is a life-safety component, we strongly recommend the OEM switch over generic aftermarket substitutes, which may trip at incorrect temperatures or fail to lock out reliably.
Moderate (2/5) — Disconnect power and gas. Remove the two mounting screws, transfer the spade wire terminals, and reinstall in the same orientation. Verify normal operation and confirm the switch resets properly after correcting the underlying fault.