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The Goodman 10123529 manual reset limit switch is a genuine OEM safety control for the VDS80603ANAA gas furnace. This normally-closed high-limit/rollout switch opens the control circuit when it senses excessive temperature — from a blocked flue, failed blower, or flame rollout — shutting the gas valve to protect the heat exchanger and your home. Because it is a manual-reset device, it stays open until an operator presses the button, forcing an inspection before the furnace can restart.
The OEM 10123529 is calibrated to the exact trip temperature Goodman engineered for this furnace's heat exchanger and burner layout. Generic limit switches with the wrong set point either nuisance-trip in normal operation or, worse, fail to open during a genuine overheat. On a safety component, match the factory spec exactly.
Disconnect power and shut off the gas before servicing. The switch is typically mounted on the burner box or heat exchanger with two screws and connected by push-on spade terminals. Note wire positions, swap the part, and restore connections. If the old switch tripped, diagnose the root cause (dirty filter, blocked vent, weak blower) before returning the unit to service.