{"product_id":"oem-goodman-170-f-primary-limit-switch-for-dms80904bna-b1370188","title":"OEM Goodman 170°F Primary Limit Switch for DMS80904BNA — B1370188","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1370188 Primary Limit Switch\u003c\/strong\u003e is the OEM main high-limit control for the \u003cstrong\u003eDMS80904BNA\u003c\/strong\u003e furnace and compatible Goodman\/Amana models. Mounted on the heat-exchanger partition, this auto-reset switch opens at \u003cstrong\u003e170°F\u003c\/strong\u003e when supply-air temperature climbs too high, cutting the burners to prevent heat-exchanger overheating while the blower continues to purge residual heat.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTrip temperature: 170°F (open on rise)\u003c\/li\u003e\n\u003cli\u003eReset type: Automatic reset\u003c\/li\u003e\n\u003cli\u003eContact configuration: Normally closed (N.C.)\u003c\/li\u003e\n\u003cli\u003eFunction: Primary high-limit safety control\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana DMS80904BNA and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eOEM part number: B1370188\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe primary limit is the furnace's main overheat guardian, so trip accuracy matters. Our \u003cstrong\u003eOEM\u003c\/strong\u003e switch is factory-matched for the 170°F set point and correct bracket fit. Generic units with a different trip temperature can cause nuisance shutdowns or, worse, allow the exchanger to overheat. We strongly recommend OEM for this control.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5).\u003c\/strong\u003e Kill power at the breaker, photograph and transfer the two wire leads, remove the two mounting screws, and seat the new switch flush against the heat-exchanger panel. Around 10–15 minutes for a DIYer. Frequent tripping typically indicates low airflow or a cracked exchanger — inspect before repeated replacements.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058040783219,"sku":"GOODMAN-B1370188","price":22.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-dms80904bna-b1370188","provider":"National HVAC Parts","version":"1.0","type":"link"}