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The genuine Goodman 10123533 manual reset limit switch is a factory high-temperature safety device for the AMH951155DXAF 95%+ AFUE gas furnace. It monitors heat-exchanger and burner-area temperature and opens the control circuit on a flame-rollout or over-temperature condition, forcing a shutdown until the fault is corrected and the switch is manually reset. It is closely related to the 10123519 but carries its own distinct temperature rating and mounting position — always match the exact number stamped on your original.
Safety limits must trip at the precise engineered temperature. Substituting a generic switch risks nuisance lockouts or delayed protection. The OEM 10123533 is factory-calibrated and dimensioned specifically for the AMH951155DXAF, so it fits and protects exactly as designed.
Easy. De-energize the furnace, unplug the two spade terminals, remove the mounting screws, fit the new switch in the identical position, and reconnect. A repeat trip signals an airflow or combustion problem to fix before returning the furnace to service.
Compatibility note: confirm 10123533 vs. 10123519 against your existing switch — they are not interchangeable.