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The Goodman 10123533 is a genuine OEM manual reset high-limit (rollout/flame) safety switch for the AMH950703BXAA gas furnace. It opens the ignition circuit if it senses excessive heat or flame rollout, then must be manually reset once the fault is cleared — an intentional safeguard that prevents an unsafe furnace from restarting on its own.
OEM limit switches are matched to the precise trip temperature specified for this furnace's heat exchanger geometry. Because this is a life-safety component tied to flame rollout, we strongly recommend the genuine part over generic substitutes with unverified trip points.
Easy (2/5). Roughly 15 minutes: cut power at the disconnect, note terminal orientation, unplug the leads, remove the mounting screws, and install the replacement. Important: a tripped limit switch is a symptom — inspect for restricted airflow, a dirty filter, or a cracked heat exchanger before returning the furnace to service.