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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM flame-rollout safety control for the Goodman GKS90453BXAF gas furnace and related GKS90 models. The red cap denotes its higher trip temperature within the rollout-protection scheme — it works alongside companion switches to shut down the burners if flame rollout or a blocked heat exchanger is detected. Manual reset ensures the furnace stays locked out until a technician inspects and clears the fault.
The red OEM switch is set to a specific factory trip point. Substituting a generic or the wrong-color switch can defeat the layered rollout protection and cause improper cutoff behavior. Match the exact OEM part to preserve the furnace's certified safety response.
Easy (1/5) — Kill power and gas, disconnect the spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 10 minutes for a qualified tech.