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The Goodman 1370901S is a genuine OEM high-temperature limit switch rated at 180°F for the GMN120-5 gas furnace and compatible Goodman/Amana models. This safety control monitors heat-exchanger/plenum temperature and opens the circuit to shut off the burners if the furnace overheats — protecting against restricted airflow, a dirty filter, or blower failure. A tripped or failed limit switch causes no-heat or short-cycling.
The OEM switch is calibrated to Goodman's exact 180°F trip temperature and mounting flange. Because this is a safety device, an incorrectly rated generic can trip early (nuisance shutdowns) or too late (overheating). We strongly recommend OEM for limit controls.
Easy — 15 to 20 minutes. Disconnect power, remove two mounting screws, transfer the wiring, and reinstall in the same orientation. Correct temperature rating is critical — always match 180°F.