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The 10123533 is a genuine Goodman/Amana manual reset high-limit / rollout safety switch for the AMH950453BXAA gas furnace and compatible Goodman models. This normally-closed thermal switch opens the control circuit if it senses an over-temperature or flame-rollout condition, shutting down the furnace to prevent damage or hazard. Because it is manual reset, it must be physically reset after a trip — a deliberate safety design that flags a fault for service. A failed or nuisance-tripping switch should be replaced only with the correct OEM part.
This is a safety control — its trip temperature is calibrated to your furnace's design. OEM guarantees the correct set point and reset behavior. Generic switches with mismatched temperature ratings can either nuisance-trip or fail to protect the equipment. Always use OEM for safety switches.
Easy to Moderate — shut off power, disconnect the two spade terminals, unscrew the switch, and mount the replacement in the same position. A nut driver and multimeter (to confirm continuity) are helpful. If the switch keeps tripping after replacement, have a technician diagnose the underlying overheat cause.