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The Goodman 10123529 is a genuine OEM manual-reset high-limit safety switch for the AMVC80603BNBC and compatible Goodman/Amana gas furnaces. This switch protects the furnace from dangerous overheating and flame rollout — if it senses an over-temperature condition, it opens the circuit and shuts the furnace down, requiring a manual reset button press before the unit can restart. That deliberate manual reset is a safety feature: it forces a technician to inspect the cause rather than letting the furnace short-cycle on a fault.
A tripped or failed limit switch is a common cause of a furnace that will not fire, or one that locks out repeatedly. If the switch has opened permanently or won't reset, replacement with the exact OEM part is required.
Safety switches must match the factory trip temperature and mounting exactly. The genuine OEM Goodman 10123529 is calibrated to the AMVC series specification. Generic substitutes with the wrong trip point can nuisance-trip or, worse, fail to protect the heat exchanger. For a life-safety component, always use OEM.
With power off, disconnect the two spade terminals, unfasten the switch from its bracket, and mount the new 10123529 in the same orientation. Reconnect wiring and press the reset button. Typical replacement is 15–25 minutes. Never bypass a limit switch.