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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM safety control for the ACVC960403BNAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch monitors for flame rollout or excessive heat and opens the circuit to shut down the burners if an unsafe temperature is detected. Because it is manual reset, it stays open after a fault until physically reset — a deliberate safety feature that flags a problem (such as a blocked flue or failed inducer) rather than silently cycling.
Safety controls should never be substituted with non-rated parts. This genuine OEM Goodman switch is calibrated to the furnace's exact trip temperature. Generic switches with the wrong setpoint can either nuisance-trip or, worse, fail to protect against rollout. Always use the OEM-spec part.
Moderate (2/5) — Two spade terminals and a mounting screw or two. Shut off power and gas, and verify the underlying fault is resolved before resetting. If unsure, consult a licensed HVAC technician.