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The Goodman 10123529 is a genuine OEM manual-reset high-limit safety switch for the ADSS800804BXAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit and shuts off the burners if it senses excessive heat — protecting the furnace against overheating and flame rollout. Because it is manual-reset, it must be pressed to close again after a fault, which alerts the homeowner to a real problem rather than silently cycling.
The OEM Goodman 10123529 is calibrated to the exact trip temperature Goodman engineered for this furnace, ensuring the safety opens at the correct point — not too early (nuisance shutdowns) or too late (unsafe). Generic switches with an approximate trip point can undercut this protection. For a safety device, always match OEM calibration.
Moderate (2/5). Shut off gas and power. Disconnect the two spade terminals, remove the mounting screws, and install the new 10123529 in the identical location and orientation. Reconnect wiring, restore power, and verify a normal heat cycle. If the new switch trips, diagnose the underlying overheating cause (dirty filter, blocked flue, or weak blower).
Compatible with Goodman ADSS800804BXAA furnaces. Genuine OEM safety part, fast shipping.