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The Goodman 10123539 is a genuine OEM manual-reset limit / flame-rollout safety switch engineered for the VCES961005CNAA gas furnace. Mounted near the burner assembly, it monitors for abnormal heat or flame rollout and opens the ignition circuit to shut the furnace down if a dangerous over-temperature condition occurs. Because it is a manual-reset device, it stays open until a technician presses the reset button — ensuring the root cause (blocked flue, cracked heat exchanger, dirty burners) is addressed before the furnace runs again.
OEM 10123539 switches are calibrated to the exact trip temperature Goodman specifies for this furnace and use the correct bracket and terminal orientation. Generic aftermarket limits may trip at the wrong setpoint, causing nuisance shutdowns or, worse, failing to protect the appliance. For a safety-critical part, install the OEM switch.
Moderate (2/5). Shut off power and gas, remove the burner-compartment door, disconnect the two spade terminals, unscrew the switch, and reverse to install. Verify normal operation and no rollout after service.