{"product_id":"oem-goodman-stack-overtemp-limit-switch-for-gun125-5-b1370109","title":"OEM Goodman Stack Overtemp Limit Switch for GUN125-5 — B1370109","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370109 Stack Overtemp Limit Switch\u003c\/strong\u003e is a factory OEM safety control engineered for the Goodman\/Amana \u003cstrong\u003eGUN125-5\u003c\/strong\u003e gas furnace. Mounted on the flue collector or heat exchanger stack, this normally-closed switch continuously monitors flue-gas temperature and opens the burner circuit if the furnace exceeds its safe operating limit — protecting the heat exchanger from cracking and preventing dangerous overheating.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1370109\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Stack \/ flue overtemperature limit switch (auto-reset)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Normally-closed high-limit safety cutout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GUN125-5 gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman OEM replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eChoosing the \u003cstrong\u003egenuine OEM B1370109\u003c\/strong\u003e guarantees the exact trip temperature and mechanical footprint Goodman engineered for the GUN125-5. Aftermarket universal limit switches often use approximate temperature ratings and can nuisance-trip or fail to protect the heat exchanger. For a safety-critical component, OEM is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e A single two-wire connection and one mounting screw. Always shut off gas and electrical power before servicing. If you are unsure about safety controls, consult a licensed HVAC technician.\u003c\/p\u003e\u003cp\u003eEvery part is inspected for correct fit before shipping. Order the Goodman B1370109 today to restore your furnace's high-limit protection.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058189615475,"sku":"GOODMAN-13165","price":19.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-stack-overtemp-limit-switch-for-gun125-5-b1370109","provider":"National HVAC Parts","version":"1.0","type":"link"}