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The genuine Goodman 10123529 Manual Reset Limit Switch is an OEM high-temperature safety control for the Goodman ACVM971005CNAA furnace and compatible models. This normally-closed thermal switch opens the control circuit and shuts the furnace down if it senses an over-temperature condition — typically caused by a blocked flue, failed blower, dirty filter, or restricted airflow. Because it is a manual reset device, it must be physically reset by pressing the button after the fault is corrected, ensuring a technician verifies the cause before the unit can fire again.
The OEM 10123529 is calibrated to the exact trip temperature Goodman engineered for this furnace's heat exchanger and bracket geometry. Generic substitutes with the wrong trip point or terminal spacing can nuisance-trip or, worse, fail to protect the unit. On a safety component, always fit OEM.
Moderate (2/5). Cut power at the breaker, remove the burner/blower access panel, unplug the two spade terminals, unscrew the mounting bracket, and reverse to install. About 15–20 minutes for a confident DIYer; a meter to confirm continuity is recommended.