{"product_id":"oem-goodman-170-f-primary-limit-switch-for-gmnt120-5b-b1370188","title":"OEM Goodman 170°F Primary Limit Switch for GMNT120-5B — B1370188","description":"\u003ch2\u003eGoodman B1370188 170°F Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1370188\u003c\/strong\u003e is a genuine OEM primary high-limit switch rated at \u003cstrong\u003e170°F\u003c\/strong\u003e, engineered as a direct-fit replacement for the \u003cstrong\u003eGMNT120-5B\u003c\/strong\u003e gas furnace. The primary limit is the furnace's main overheat protector, mounted on the heat-exchanger bulkhead. It monitors supply-air temperature and shuts off the gas valve if the furnace overheats from restricted airflow, protecting the heat exchanger and blower from thermal damage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTrip temperature: 170°F (open on rise)\u003c\/li\u003e\n\u003cli\u003eType: primary high-limit control\u003c\/li\u003e\n\u003cli\u003eReset: automatic reset on cool-down\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4 in. spade connections\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMNT120-5B furnace\u003c\/li\u003e\n\u003cli\u003eOEM part number: B1370188\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine OEM Goodman\u003c\/strong\u003e limit is factory-calibrated to the 170°F cutout specified for your model. The primary limit is a safety-critical component; substituting a generic switch with a mismatched trip temperature or sensor length can cause short cycling or leave the heat exchanger unprotected. Always use the OEM-rated part for this position.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy to Moderate (2.5\/5).\u003c\/strong\u003e Cut power, remove the two spade wires and mounting screws, and install the replacement in the same orientation. If the primary limit keeps tripping, inspect the filter, blower speed, and ductwork for airflow restrictions before replacing.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFits Goodman GMNT120-5B. Always shut off power at the breaker before servicing.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058131911027,"sku":"GOODMAN-11758","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-gmnt120-5b-b1370188","provider":"National HVAC Parts","version":"1.0","type":"link"}