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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM thermal safety cutout used on the AMH950453BXAB 95% AFUE gas furnace. The red cap identifies its specific trip-temperature rating, which differs from the companion 10123533 — these switches are placed at different locations (such as burner-box rollout vs. main high-limit) and are not interchangeable by color alone. Always match the part number and mounting position when replacing.
The color-coded trip point on this switch exists for a reason: install the wrong rating and you either lose overheat protection or trigger constant nuisance shutdowns. Generic substitutes rarely match the factory setpoint precisely. The OEM 10123535 is the exact specified part, keeping the furnace's layered safety chain intact.
Easy to Intermediate. A single- or dual-terminal wire swap held by one or two screws. Kill power first, transfer wires one at a time to avoid mix-ups, and re-seat the switch flush to its bracket. If it trips after reset, stop and diagnose the underlying overheat cause rather than repeatedly resetting.