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The Goodman 10123517 is a genuine OEM manual reset high-limit switch for the ACVC90905DXAB furnace and compatible Goodman/Amana models. This safety control monitors heat-exchanger temperature and opens the circuit to shut down the burners if the furnace overheats — protecting against blocked airflow, failed blowers, or restricted venting. Unlike auto-reset limits, the manual reset design requires a deliberate button press to restore operation, prompting a technician to diagnose the root cause of the overheat.
The genuine OEM 10123517 is calibrated to Goodman's exact trip and reset temperatures — a safety-critical spec. Generic limit switches with the wrong trip point can either nuisance-trip or, worse, fail to protect the heat exchanger. For a life-safety component, always use OEM.
Moderate (3/5) — Requires shutting off power and gas, removing the access panel, transferring two wire leads, and remounting the switch. Best performed by an HVAC professional. Allow 20–30 minutes.