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The 10123535 is a genuine OEM Goodman red manual-reset high-limit / flame-rollout safety switch and a direct-fit replacement for the GKS90703BXAH gas furnace. The red button identifies it as a higher-temperature rollout control distinct from the standard limit switch. It opens the ignition circuit the instant it senses a flame rollout or excessive heat at the burner box, protecting the furnace and home from an unsafe condition.
Rollout switches are safety-critical, and the OEM 10123535 is factory-set to the exact trip temperature specified for this furnace. Substituting a generic switch with a different rating risks nuisance lockouts or a bypassed safety. The OEM part guarantees the correct calibration, color-coded rating, and fit.
Easy to Moderate. Plan on 10–20 minutes: cut power and gas, photograph the leads, unplug the spades, remove the mounting screws, and fit the replacement in the identical position. Reconnect and press the reset button. Important: a tripped rollout switch almost always means a cracked heat exchanger, blocked flue, or dirty burners — have the root cause inspected by a qualified technician before restoring heat.
Always disconnect power before servicing.