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The Goodman 10123535 Manual Reset Limit Switch (red) is a genuine OEM high-temperature safety control for the WGFM195090S4CAD furnace and compatible Goodman/Amana models. The red housing designates a distinct trip set point from the standard limit, so it is important to match the exact OEM number rather than substituting a similar-looking switch. Like all manual-reset limits, it locks out on an overheat event and requires a physical press of the reset button before the furnace will fire again — a deliberate safeguard against repeated unsafe cycling.
The genuine OEM 10123535 guarantees the correct factory trip temperature that the red designation represents. Aftermarket alternatives rarely match color-coded set points precisely, which can lead to premature lockouts or, worse, a switch that fails to protect against a genuine overheat. On a safety-critical control, buy OEM.
Easy (2/5) — Cut power at the disconnect, snap a photo of the existing wiring, transfer the two spade connectors, and mount the new switch with the original screws. Typically a 15-minute job. Repeated tripping after replacement points to an airflow, flue, or gas-valve problem that a qualified technician should investigate.