{"product_id":"goodman-b1370188-genuine-oem-primary-limit-switch-l170-40f","title":"Goodman B1370188 – Genuine OEM Primary Limit Switch (L170-40F)","description":"\u003ch1\u003eGoodman B1370188 – Genuine OEM Primary Limit Switch (L170-40F)\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eGoodman B1370188\u003c\/strong\u003e is a critical \u003cstrong\u003eGenuine OEM Primary Limit Switch\u003c\/strong\u003e designed for Goodman, Amana, and Janitrol gas furnaces. This safety-critical sensor acts as the primary \"high-limit\" watchdog for the heat exchanger, ensuring the burner circuit is interrupted if internal temperatures exceed safe factory parameters, preventing equipment damage and potential fire hazards.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Performance:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFactory-calibrated with an \u003cstrong\u003eL170-40F\u003c\/strong\u003e rating, this switch is designed to \u003cstrong\u003eopen at 170°F\u003c\/strong\u003e and automatically \u003cstrong\u003ereset (close) once the temperature drops by 40°F\u003c\/strong\u003e (to 130°F). As a \"normally closed\" component in the 24V safety string, it provides instantaneous response to restricted airflow conditions, ensuring the furnace fails into a safe state if the blower motor or air filter fails.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 1: Precision Thermal Protection:\u003c\/strong\u003e Engineered to trip at exactly 170°F to protect the structural integrity of the heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 2: Automatic Reset Logic:\u003c\/strong\u003e The switch restores the electrical circuit automatically once the system cools, allowing the furnace to resume normal operation after the fault is cleared.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 3: High-Grade Bimetal Actuator:\u003c\/strong\u003e Features a rapid-response bimetal disc that ensures accurate temperature sensing over thousands of heating cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 4: Direct-Fit Mounting:\u003c\/strong\u003e Features a standard two-hole mounting flange for a secure, airtight seal against the furnace plenum or blower deck.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1370188 (Replaces B13701-88, 11114701)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Goodman \/ Amana (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Primary High Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e Opens @ 170°F \/ Closes @ 130°F (L170-40)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24V \/ 60Hz Control Circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 2-Hole Flange Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Automatic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.1 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ \u003cstrong\u003eHVAC Depot Pro Tip: The \"Static Pressure\" Check\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eIf this 170°F limit switch is tripping, your furnace is likely \"panting\" for air. Before replacing the switch, check your air filter and ensure all supply registers are open. A high-efficiency furnace with a high-MERV 1-inch filter often creates enough static pressure to trip a 170-degree limit. Consider switching to a lower-resistance filter if you experience nuisance trips after installation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference \u0026amp; Compatibility:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eB1370188\u003c\/strong\u003e is a direct OEM replacement for the following part numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Numbers:\u003c\/strong\u003e B13701-88, B1370188, 11114701, L170-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Refs:\u003c\/strong\u003e L170, 36TX11, 20162904 (compatible setpoints)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGoodman GMS8 Series:\u003c\/strong\u003e GMS80403AN, GMS80603AN, GMS80804BN, GMS81005CN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGoodman GDS8 Series:\u003c\/strong\u003e GDS80403AN, GDS80603AN, GDS80804BN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmana AMH8 Series:\u003c\/strong\u003e AMH80403AN, AMH80603AN, AMH80804BN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaged Units:\u003c\/strong\u003e GPG, APG, GPC Series\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":52572383969643,"sku":"193031151947","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/B1370188.jpg?v=1768668248","url":"https:\/\/tophvacparts.com\/products\/goodman-b1370188-genuine-oem-primary-limit-switch-l170-40f","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}