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The Goodman 10123535 Manual Reset Limit Switch is a genuine OEM overtemperature safety control for the AMS950904CXA furnace, identified by its red reset button. The color designates a specific factory trip temperature, so this switch is not interchangeable with the companion 10123533 unit even though both are manual-reset limits. It opens the control circuit on a flame-rollout or overheat event to protect the heat exchanger and prevent unsafe operation.
The red button is a calibration marker — matching it matters. A generic look-alike with a different setpoint can nuisance-trip on every call for heat or fail to protect the heat exchanger. This genuine Goodman OEM part guarantees the correct trip temperature and terminal geometry for your unit.
Easy (2/5). Disconnect power and gas, transfer the spade terminals to the new switch, mount, and reset. Confirm you are matching the red switch to the red-switch location on the burner assembly. If it trips again after install, diagnose the airflow or rollout cause — never jumper a safety switch.