{"product_id":"oem-goodman-120-f-auxiliary-limit-switch-for-gmth045-3b-b1370155","title":"OEM Goodman 120°F Auxiliary Limit Switch for GMTH045-3B — B1370155","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370155 Auxiliary Limit Switch\u003c\/strong\u003e is a genuine OEM safety control engineered for the \u003cstrong\u003eGMTH045-3B\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. This normally-closed thermal switch opens at approximately \u003cstrong\u003e120°F\u003c\/strong\u003e to interrupt the ignition sequence if it detects an overheat or airflow-restriction condition, protecting the heat exchanger and blower housing from damage. It is a primary safety component — a failed or nuisance-tripping limit switch is one of the most common causes of a furnace that lights briefly then shuts down.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1370155\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Auxiliary \/ rollout limit switch (manual or auto reset per position)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 120°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Normally-closed high-temperature cutout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GMTH045-3B and related furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman (OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is the factory-specified Goodman part with the exact trip temperature and terminal configuration your furnace's control logic expects. Generic universal limit switches often use a different cut-out point or bracket, which can cause premature tripping or fail to protect at the correct threshold. For a safety-critical control, we recommend the OEM part.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Two spade terminals and one or two mounting screws. Always cut power at the disconnect before servicing. If you are unsure why the original switch failed, have a qualified HVAC technician confirm there is no underlying overheat condition.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058165629299,"sku":"GOODMAN-12530","price":11.96,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-120-f-auxiliary-limit-switch-for-gmth045-3b-b1370155","provider":"National HVAC Parts","version":"1.0","type":"link"}