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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the AMVC80905CXAB gas furnace. Unlike auto-reset limits, a manual-reset switch permanently opens the control circuit when it trips and stays open until an operator physically presses the reset button — forcing a technician to inspect and correct the fault before the furnace can fire again. This makes it a critical last line of defense against heat-exchanger over-temperature and flame rollout.
The trip temperature on a rollout switch is a safety-rated value matched to your furnace. A generic switch with the wrong rating either nuisance-trips or, worse, fails to open when it should. This genuine Goodman part is calibrated to the factory setpoint and uses the correct terminal and mounting configuration for a true direct fit.
Easy (2/5). Mounts with screws and quick-connect terminals. Disconnect power before servicing. Important: a tripped manual-reset limit indicates an underlying problem — a cracked heat exchanger, blocked flue, or restricted airflow — so diagnose and fix the root cause before resetting or replacing the switch.