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The Goodman 10123538 is a genuine OEM manual reset limit switch for the ACVC960603BNBA variable-speed gas furnace. This is a safety control: it monitors temperature in the burner/heat-exchanger area and opens the circuit to shut off the burners if a dangerous overheat or flame-rollout condition occurs. Because it is a manual reset device, it locks out and must be physically reset by pressing its button after the fault is cleared — a deliberate design that forces a service check before the furnace can fire again.
OEM vs. Generic: A limit switch is a life-safety component — its trip temperature and electrical ratings must match the furnace exactly. The OEM 10123538 is calibrated to Goodman's specification. Substituting a generic switch with a different trip point can cause nuisance lockouts or, worse, fail to protect against a real overheat. Use OEM here.
Install Difficulty: Moderate (3/5). Disconnect power and gas, remove the access panel, unplug the wiring, unscrew the switch, and reverse to install. If this switch tripped, diagnose the underlying cause (blocked exhaust, dirty filter, cracked heat exchanger) before returning the furnace to service. When in doubt, consult a licensed HVAC technician.