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The 10123533 manual-reset limit switch is a genuine Goodman/Amana safety control for the AMEC960302BNAB gas furnace. This flame-rollout / high-limit switch monitors for abnormal temperature or flame rollout at the burner and interrupts power to shut the furnace down if a dangerous condition is detected. Because it is a manual-reset device, it will not automatically re-close after tripping — a technician must inspect the cause and press the reset button, an intentional safety design.
The genuine OEM switch is calibrated to the furnace's factory trip temperature and terminal layout. Because this is a life-safety component, a mismatched generic trip point can nuisance-trip or fail to protect against rollout. Always use the OEM-spec part for safety controls.
Moderate. Shut off power and gas, note wire positions, unscrew the old switch, and transfer the leads. Roughly 20–30 minutes. Investigate why the switch tripped before resetting or replacing.