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The Goodman 1370908S Limit Switch is a genuine OEM 160°F high-limit safety control with a 7-inch insertion depth, built for the GUS125-5 gas furnace. This thermal switch monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — protecting against restricted airflow, a dirty filter, or a failed blower. If your furnace short-cycles on temperature or locks out on a limit fault, replacing a tripped or failed switch is the fix.
The OEM 1370908S is calibrated to the exact 160°F trip point and 7-inch probe length the GUS125 heat exchanger requires. A generic switch with the wrong temperature rating or probe length can nuisance-trip or, worse, fail to protect the furnace. Safety controls are one place where OEM matters most.
The limit switch mounts to the heat-exchanger panel with two screws and two spade terminals. Cut power, remove the two screws, transfer the wires, and mount the new switch. A 15-minute job for most DIYers — but do not bypass or jumper a limit switch; it is a life-safety device.