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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM high-temperature safety cutout for the GKS90904CXAD gas furnace. The red cap denotes a distinct trip-temperature calibration from the standard switch — it is critical to match the correct color/setpoint to the location it protects (e.g., rollout vs. main limit). This switch opens the gas-valve or burner circuit on an overheat condition and requires a manual push to reset, flagging that a root-cause airflow or flame issue needs attention.
This OEM Goodman red switch carries the precise factory setpoint your furnace's safety chain was designed around. Substituting a generic switch — or the wrong-color OEM switch — can defeat the intended protection. Always replace red with red and confirm the part number.
Easy–Moderate (2/5). Cut power at the disconnect, photograph the wiring, unbolt the bracket, and install the replacement in the same orientation. Verify continuity with a meter and test-fire the furnace afterward.
Questions on setpoint or placement? Reach us at info@nationalhvacparts.com.