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The Goodman 10123537 Manual Reset Limit Switch (gray body) is a genuine OEM safety control for the AMV90905DXBA gas furnace and compatible Goodman/Amana units. This high-limit switch opens the control circuit if the furnace exceeds its safe operating temperature — protecting the heat exchanger and surrounding components from overheating or flame rollout. Because it is a manual reset device, a tripped switch requires a technician to press the reset button after diagnosing the root cause, adding an extra layer of protection over auto-reset limits.
The OEM 10123537 is factory-calibrated to the furnace's precise trip temperature. Generic limit switches with a different set-point can trip prematurely (nuisance shutdowns) or fail to trip when needed — a safety risk. For a critical safety component, use the genuine OEM part.
Easy (2 of 5). Cut power to the furnace, remove two mounting screws, transfer the wire leads, and secure the new switch. Confirm the mounting surface is clean for accurate heat sensing, then press the reset button before restoring power.
Keep the AMV90905DXBA furnace protected with this genuine Goodman manual reset limit switch.