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The 1370909S is a genuine OEM 160°F, 3-inch temperature limit switch for Goodman GDT070-3 gas furnaces and compatible Goodman/Amana models. This normally-closed high-limit safety opens the burner circuit if furnace temperatures climb past its trip point — protecting the heat exchanger and cabinet from overheating caused by restricted airflow, a dirty filter, or a failed blower. A limit that has tripped permanently or drifted out of calibration will prevent the furnace from firing or cause repeated shutdowns.
The OEM Goodman 1370909S is calibrated to the exact 160°F trip point and 3-inch insertion depth Goodman engineered for this furnace. Generic switches with a different set point or probe length can nuisance-trip or, worse, fail to protect the heat exchanger. For a safety limit, matching the factory spec exactly is essential — choose genuine OEM.
Easy (2 of 5). Shut off gas and power, note the wiring, remove the mounting screws, and install the replacement at the same depth and orientation. Confirm continuity when cool and restore airflow before running. Always address the root cause of an overheat before replacing a tripped limit.