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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-limit safety control for the AMH950703BXAG gas furnace. This switch monitors temperature and opens the circuit to shut off the burners if the furnace overheats, protecting the heat exchanger and cabinet from damage. Because it is manual-reset, it will not automatically re-close after a trip — a deliberate safety feature that forces inspection of the underlying fault.
The OEM 10123533 is calibrated to the exact trip temperature Goodman specifies for this furnace. A generic switch with a different trip point may nuisance-trip or, worse, fail to open at the correct temperature — defeating its purpose as a safety device. For a component whose entire job is protecting against overheating, matching the OEM calibration is essential.
Moderate (2/5). Disconnect furnace power, note the wiring, unscrew the old switch from its mounting bracket, and install the replacement with the same orientation and connections. After install, address whatever caused the original trip (dirty filter, blocked airflow) before resetting and running the furnace.