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The Goodman 10123535 is a genuine OEM red manual reset limit switch for the GKS90703BXAD gas furnace and compatible Goodman/Amana models. The red button identifies this as a distinct high-temperature safety control, calibrated to a specific trip point in the furnace's safety circuit. It shuts the unit down on an over-temperature event — such as a blocked heat exchanger, blower failure, or flame rollout — and requires a manual push-button reset so the fault is never masked by automatic restarts.
This red-button switch is set to Goodman's exact factory trip temperature — matching the correct location in your furnace's safety chain. Using a generic or wrongly-rated switch on a safety control risks either nuisance lockouts or, worse, failure to shut down during a genuine overheat. Genuine OEM is the only safe option for high-limit protection.
Moderate (2/5). Turn off power and gas, note the wiring, disconnect the spade terminals, unscrew the old switch, and mount the new one identically. Restore power and press reset. Since this is a safety device, have a licensed technician diagnose and correct the root over-temperature cause before restoring normal operation.