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The Goodman 10123529 is a genuine OEM manual-reset limit (flame-rollout) switch for AMH81155CXCC and related Amana/Goodman gas furnaces. This safety device opens the gas circuit if it senses abnormal heat from flame rollout at the burner box — a critical protection against blocked heat exchangers or restricted flue conditions. Because it is manual-reset, a tripped switch signals a real combustion problem that must be diagnosed before resetting.
Rollout switches are trip-temperature-calibrated safety components. OEM guarantees the correct opening temperature your furnace was certified with; a generic with a different trip point can either nuisance-trip or, worse, fail to protect. For any safety limit, always use the OEM part.
Moderate (2/5). Two spade terminals and a bracket screw. Shut off gas and power before servicing. Never bypass a rollout switch — if it keeps tripping, inspect the heat exchanger and venting.