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The Goodman 10123529 is a genuine OEM manual reset high-limit / rollout safety switch for the AMS80805CXAC gas furnace and compatible Goodman/Amana models. This switch opens the gas valve circuit if it senses abnormal heat or flame rollout, shutting the furnace down to prevent damage and hazard. Because it is a manual reset, a tripped switch signals a real problem — but a failed or fatigued switch itself will cause repeated no-heat lockouts.
The OEM 10123529 is calibrated to the exact trip temperature specified for this furnace's heat exchanger. Generic aftermarket switches may trip early or late; on a life-safety limit, a wrong setpoint is a real hazard. We recommend OEM for all safety limits.
Easy. Cut power, disconnect the two spade terminals, unscrew the bracket, install the new switch in the same orientation, and reconnect. A 15-minute repair for a qualified technician. Always confirm the underlying cause before returning the furnace to service.