{"product_id":"oem-goodman-170-f-primary-limit-switch-for-ams80904bnaa-b1370188","title":"OEM Goodman 170°F Primary Limit Switch for AMS80904BNAA — B1370188","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370188 Primary Limit Switch\u003c\/strong\u003e is the genuine OEM 170°F auto-reset high-limit control for the \u003cstrong\u003eAMS80904BNAA\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger's supply-air side, this is the furnace's main overheat safety: if supply temperatures climb past 170°F due to restricted airflow, it cuts the burner circuit while keeping the blower running to purge excess heat, protecting the heat exchanger from cracking.\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: Auto-reset primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eFunction: Primary overheat protection\u003c\/li\u003e\n\u003cli\u003eFits: AMS80904BNAA and compatible Goodman\/Amana furnaces\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4 in. quick-connect spade\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM Goodman B1370188\u003c\/strong\u003e is calibrated to the exact 170°F set point and disc geometry the furnace requires. Because the primary limit is the last line of defense for the heat exchanger, a generic switch with drifted calibration or a mismatched insertion depth is a real safety risk. Install OEM only.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Easy.\u003c\/strong\u003e Remove two spade wires and the mounting screws, then insert the new limit at the same depth — about 15 minutes. \u003cem\u003eAlways disconnect power and gas first.\u003c\/em\u003e If the limit was tripping, correct the airflow restriction (filter, ducting, blower) before returning the unit to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057705828723,"sku":"GOODMAN-7073","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-ams80904bnaa-b1370188","provider":"National HVAC Parts","version":"1.0","type":"link"}