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The Goodman 10123529 is a genuine OEM manual-reset high-limit (rollout/overheat) safety switch for the ACVC80603BXCA gas furnace and compatible Goodman/Amana models. This thermal safety device opens the gas/ignition circuit if it senses excessive temperature or flame rollout, protecting the furnace and home from overheating. Because it is manual-reset, it must be pressed to restore operation after a trip — a switch that trips repeatedly or fails to reset should be diagnosed and replaced.
The OEM 10123529 is calibrated to the exact trip temperature and mounting footprint specified for this furnace. Because it is a primary safety control, a generic switch with a different setpoint can either nuisance-trip or, worse, fail to protect against a genuine overheat. Always use the OEM-rated limit switch.
Easy to Moderate — Disconnect power, note wiring, unscrew the old switch, mount the new one, transfer leads, and test for proper operation. Basic tools; 15–30 minutes. Have a technician confirm the underlying cause of any repeat trips.