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The Goodman 10123535 is a genuine OEM manual reset limit switch (red button) for AMH950904CXAD furnaces. Like other manual-reset limits, it opens the control circuit on an overtemperature or flame-rollout condition and locks out until physically reset. The red button identifies its specific trip setpoint and mounting location within the furnace's layered safety system, distinguishing it from companion limit switches on the same unit.
Because this switch is color-coded to a specific temperature rating, substituting a generic part risks installing the wrong setpoint. The OEM 10123535 guarantees the correct trip temperature, terminal layout, and fit for the AMH950904CXAD. For a safety-critical control, the genuine part is the only reliable choice.
About 15–20 minutes. Cut power and gas, note the wiring, disconnect the spade terminals, unscrew the old switch, mount the new one in the identical position, and reconnect. Verify normal furnace operation and proper reset action before finishing.