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The 10123517 is a genuine OEM manual-reset high-limit / flame rollout switch for the Goodman GCV90905DXBB gas furnace. This normally-closed thermal safety opens the ignition/gas circuit if it senses excessive heat or flame rollout, shutting the furnace down to prevent overheating. Because it is manual reset, a tripped switch will keep the furnace off until the underlying cause is corrected and the button is pressed — a common no-heat symptom.
OEM switches are calibrated to Goodman's exact trip temperature and use the correct terminal spacing and mounting bracket. Generic switches with the wrong setpoint can nuisance-trip or, worse, fail to open when they should. On a life-safety component, use OEM.
Easy (1/5). Cut power, note the two wire leads, unclip/unscrew the old switch, mount the new one and reconnect. Under 10 minutes. Always diagnose why the original tripped before returning the furnace to service.