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The Goodman 10123533 is a genuine OEM manual-reset high-limit safety switch for the ACEC960403BNAB furnace. This control continuously monitors temperature near the burner/heat-exchanger area and opens the circuit if it senses an unsafe overheat condition — typically caused by restricted airflow, a dirty filter, or a failing blower. Because it is a manual-reset design, it must be physically reset after a trip, alerting the homeowner that a real fault occurred rather than silently cycling.
This is a flame-safety component. The genuine Goodman 10123533 is calibrated to the exact trip temperature specified for this furnace and uses the correct mounting and terminal layout. Generic substitutes with different trip points can cause nuisance lockouts or, worse, fail to protect the heat exchanger. Always use OEM for safety controls.
Moderate (3/5). Requires shutting off power and gas, removing the burner-compartment panel, transferring two spade connectors, and remounting with the original screws. Best handled by a confident DIYer or HVAC technician.