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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM flame rollout safety control engineered for the AMH81005CNBC gas furnace and other compatible Goodman and Amana 80% AFUE models. This normally-closed switch mounts on the burner assembly and instantly opens the ignition control circuit if flames roll out of the burner box, shutting down the furnace to prevent overheating and fire hazards. Because it is a manual-reset device, a tripped switch signals a real combustion problem that should be inspected before the button is pressed to restore operation.
OEM vs. Generic: Our genuine OEM 10123529 is calibrated to the exact trip temperature Goodman specifies for this furnace, so it protects your equipment and keeps warranty coverage intact. A generic aftermarket alternative can save a few dollars but may trip early, trip late, or use a mismatched bracket — a risk that isn't worth it on a life-safety part.
Installation difficulty: Easy (1/5). Cut power at the disconnect, unplug the two spade connectors, remove one or two screws, and swap in the new switch. No refrigerant or gas work required. Most DIYers finish in under 15 minutes. If the switch has tripped, have the heat exchanger and burners inspected by a licensed technician before returning the furnace to service.