{"product_id":"oem-goodman-170-f-primary-limit-switch-for-gmt070-4-b1370919","title":"OEM Goodman 170°F Primary Limit Switch for GMT070-4 — B1370919","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370919 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM 170°F high-limit control with a 7 inch insert length, built as a direct-fit replacement for the \u003cstrong\u003eGMT070-4\u003c\/strong\u003e gas furnace. Mounted on the heat exchanger bulkhead, it monitors supply-air temperature and opens the gas\/ignition circuit if the furnace overheats — typically from restricted airflow such as a clogged filter or a failing blower. It auto-resets once temperatures return to normal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTrip temperature: 170°F (open on rise)\u003c\/li\u003e\n\u003cli\u003eInsert length: 7 in.\u003c\/li\u003e\n\u003cli\u003eReset type: automatic\u003c\/li\u003e\n\u003cli\u003eFunction: primary high-limit safety control\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMT070-4 furnace\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B1370919\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eLimit switches protect the heat exchanger from thermal damage, so the calibrated 170°F set point and correct 7 in. probe depth are critical. The genuine Goodman switch matches both exactly. Universal limits with adjustable dials require field calibration and are easy to set wrong. For a heat-exchanger safety, choose OEM.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy.\u003c\/strong\u003e Remove two mounting screws, transfer the two wire leads, and seat the new switch at the same depth — about 15 minutes. Disconnect power first. Repeated tripping usually means an airflow problem, not a bad switch.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058157961587,"sku":"GOODMAN-12328","price":20.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-gmt070-4-b1370919","provider":"National HVAC Parts","version":"1.0","type":"link"}