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The Goodman 10123533 is a genuine OEM manual reset limit switch (flame rollout / high-limit safety) designed for AMH950905DXAD high-efficiency gas furnaces. This normally-closed thermal switch opens the control circuit if it senses excessive heat or flame rollout, shutting the furnace down to prevent overheating, heat-exchanger damage, and fire risk. As a manual reset device, it must be pressed to reset once the fault is cleared — a deliberate safeguard that forces inspection before the furnace can restart.
The genuine 10123533 is calibrated to the exact trip temperature specified for this furnace, so it protects the heat exchanger without nuisance trips. Generic switches with a different set point can either trip early (frustrating no-heat calls) or too late (defeating the safety function). For a safety control, always match the OEM trip rating.
Easy (2/5). Disconnect the two spade wires, unscrew the switch from the burner/heat-exchanger bracket, mount the new one, and reconnect. About 15 minutes with a nut driver. Shut off gas and power before servicing, and investigate why the original tripped before restoring heat.