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The 10123529 is a genuine Goodman manual-reset high-limit safety switch used in VDS80603AXAA gas furnaces. This normally-closed thermal switch opens the control circuit if it senses excessive temperature or flame rollout, shutting the furnace down to prevent a fire or heat-exchanger damage. Because it is a manual-reset device, it must be physically reset after tripping — a repeated trip signals an underlying airflow or combustion problem that should be diagnosed.
The genuine OEM Goodman switch is calibrated to the exact trip temperature specified for this furnace. Generic limit switches with the wrong cutoff point either nuisance-trip or, worse, fail to protect the appliance. As a life-safety component, the OEM part is the correct and recommended choice.
Easy (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. A 15–20 minute job — but if the switch was tripping, have the root cause (dirty filter, blocked flue, failed blower) inspected.