{"product_id":"goodman-b1370189-primary-limit-switch-200-f-30-f-thermal-safety-oem-replacement","title":"Goodman B1370189 Primary Limit Switch 200°F-30°F Thermal Safety OEM Replacement","description":"\u003ch1\u003e\u003cstrong\u003eGoodman B1370189 Primary Limit Switch 200°F-30°F Thermal Safety OEM Replacement\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eGoodman B1370189 \u003c\/strong\u003eis a critical safety component that acts as the \"brain\" for \u003cstrong\u003ehigh\u003c\/strong\u003e-\u003cstrong\u003etemperature \u003c\/strong\u003ethermal \u003cstrong\u003eprotection \u003c\/strong\u003ewithin your furnace. This \u003cstrong\u003egenuine OEM \u003c\/strong\u003eprimary \u003cstrong\u003elimit switch \u003c\/strong\u003eis designed to monitor the temperature of the heat exchanger, ensuring that the system \u003cstrong\u003edoes not exceed \u003c\/strong\u003esafe operating parameters. It is specifically \u003cstrong\u003eengineered for \u003c\/strong\u003ethe \u003cstrong\u003eGMS8\u003c\/strong\u003e, \u003cstrong\u003eGDS8\u003c\/strong\u003e, and \u003cstrong\u003eGMS9 \u003c\/strong\u003efurnace series. By detecting restricted airflow—often caused by a dirty filter or failing blower—this \u003cstrong\u003eswitch serves \u003c\/strong\u003eas a \u003cstrong\u003efail-safe\u003c\/strong\u003e that breaks the 24V circuit to the \u003cstrong\u003egas valve\u003c\/strong\u003e, \u003cstrong\u003epreventing \u003c\/strong\u003eheat exchanger \u003cstrong\u003edamage \u003c\/strong\u003eand ensuring the safety of your home.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Part Number B1370189: \u003c\/strong\u003eThis factory-calibrated safety device ensures the temperature trip points match the original design specifications of your Goodman\/Amana unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Thermal Calibration: \u003c\/strong\u003eFeatures a 200°F \"Open\" and 170°F \"Close\" (30°F differential) setting, providing the exact sensitivity needed to protect the heat exchanger from warping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixes Intermittent \"No Heat\" Issues:\u003c\/strong\u003e Replaces aging switches that have become \"weak\" or \"lazy,\" causing the furnace to cycle off prematurely before reaching the thermostat setpoint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Safety Monitoring:\u003c\/strong\u003e Provides a constant thermal watchdog for the combustion chamber, immediately halting gas flow if the internal cabinet temperature rises above the 200°F threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold-Plated or High-Temp Contacts:\u003c\/strong\u003e Engineered to handle thousands of cycles in high-heat environments without the internal contacts pitting or sticking.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman \/ Amana \/ Janitrol\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Goodman Manufacturing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart #: \u003c\/strong\u003eB1370189\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\/SKU:\u003c\/strong\u003e 662766113971 \/ 193031151954\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1 LB ounces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24 VAC (Control Circuit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 200°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature:\u003c\/strong\u003e 170°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Standard Flange Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminals:\u003c\/strong\u003e 1\/4\" Male Quick Connect\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\"Check the Filter First\"—before you replace the B1370189, verify that your furnace air filter is clean and that all supply registers are open. A primary limit switch usually trips because of an airflow restriction, not because the switch is \"bad.\" During your Diagnostic Check, observe the furnace LED: if you see a \"Limit Switch Open\" code (typically 4 flashes), ensure the blower motor is spinning at the correct speed. If the filter is clean and the blower is running but the switch still trips, you likely have a cracked heat exchanger or a failing limit switch that requires immediate replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded \/ Legacy Numbers:\u003c\/strong\u003e\u003c\/h3\u003e\nB13701-89, B1370189S, 107342-05\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eEquivalent Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nL150-30, 36TX11, 20197711\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eWhite-Rodgers \/ Emerson Equivalents:\u003c\/strong\u003e\u003c\/h3\u003e\n3F01-150 (Logic Series)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGMS8 \u003c\/strong\u003e(Suffixes: 0453ANA, 0703ANA, 0704BNA, 0904BNA, 0905CNA, 1155CNA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGDS8 \u003c\/strong\u003e(Suffixes: 0453ANA, 0703ANA, 0904BNA, 1155CNA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGMS9 \u003c\/strong\u003e(Suffixes: 0453BXA, 0703BXA, 0904CXA, 1155DXA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDMS8\u003c\/strong\u003e (Suffixes: 0453ANA, 0703ANA, 0904BNA, 1155CNA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDMS9 \u003c\/strong\u003e(Suffixes: 0453BXA, 0703BXA, 0904CXA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGCH9 \u003c\/strong\u003e(Suffixes: 0453BXA, 0703BXA, 0904CXA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGDS8 \u003c\/strong\u003e(Suffixes: 0453AXA, 0703AXA, 0904BXA, 1155CXA)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":52451500065131,"sku":"B1370189","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/B1370189.jpg?v=1773329992","url":"https:\/\/tophvacparts.com\/products\/goodman-b1370189-primary-limit-switch-200-f-30-f-thermal-safety-oem-replacement","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}