{"title":"NT-12S, NT-16S, \u0026 NT-20S Suburban Parts Breakdown","description":"\u003ch1\u003eNT-12S, NT-16S, \u0026amp; NT-20S\u003c\/h1\u003e\n\u003ch1\u003eSuburban Parts Breakdown \u003c\/h1\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Suburban_NTS_1_1024x1024.jpg?v=1774318483\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Suburban_NTS_2_1024x1024.jpg?v=1774318549\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e","products":[{"product_id":"23484-suburban-limit-sw-l77-nt20sq-yellow","title":"233484 Suburban LIMIT SW – L77 – NT20SQ – (YELLOW)","description":"\u003ch1 class=\"product_title entry-title\"\u003e\u003cstrong\u003e233484 Suburban LIMIT SW – L77 – NT20SQ – (YELLOW)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003cstrong\u003e233484 Suburban Limit Switch – L77 – NT20SQ (Yellow)\u003c\/strong\u003e \u003cstrong\u003eNT-12 16 20S\u003c\/strong\u003e is the OEM auto‑reset high‑limit switch used in Suburban \u003cstrong\u003eNT20SQ\u003c\/strong\u003e furnaces. It protects the furnace from overheating by opening the circuit when the heat exchanger reaches its rated temperature limit. Once temperatures drop back into the safe range, the switch automatically resets and allows the furnace to resume normal operation. Your product page confirms the part number, color, and compatibility, along with the list of OEM replacement numbers.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eReplaces: \u003c\/strong\u003eA31023, 230621, 230635, 233020, 233021, 233022\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv class=\"relative pb-6 w-full after:border-b after:border-stroke-300 after:w-full after:absolute after:mt-3\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eFunction and Role in the Furnace\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis limit switch is part of the furnace’s safety chain. It:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMonitors heat exchanger temperature\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOpens the circuit if temperatures exceed the \u003cstrong\u003eL77°F\u003c\/strong\u003e limit rating\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAutomatically resets when temperatures fall\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrevents overheating, short‑cycling, and heat‑exchanger damage\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWorks with the sail switch, ignition board, and thermostat to maintain safe operation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eA failing limit switch often causes intermittent heating, furnace shutdowns, or blower‑only operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOEM Suburban \u003cstrong\u003eauto‑reset limit switch\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTemperature rating: \u003cstrong\u003eL77\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDesigned for \u003cstrong\u003eNT20SQ\u003c\/strong\u003e furnaces\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eYellow identification for correct model matching\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDirect‑fit replacement with OEM wiring and mounting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRestores proper furnace safety and cycling behavior\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Laurelhurst","offers":[{"title":"Default Title","offer_id":42464827867202,"sku":"S233484","price":3.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot2025-09-21185613.png?v=1758506202"},{"product_id":"161154-suburban-heat-only-thermostat-white-snap-action","title":"161154 Suburban HEAT ONLY THERMOSTAT, WHITE Snap action","description":"\u003ch1\u003e161154 Suburban RV Heat Only Thermostat, White, Snap action \u003c\/h1\u003e\n\u003ch3\u003eFit for All Suburban RV Furnace Models\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003cstrong\u003eSuburban 161154 Heat‑Only Thermostat\u003c\/strong\u003e is a reliable, mechanical snap‑action thermostat designed for single‑stage RV furnace control. Its simple design provides dependable temperature regulation without batteries, digital displays, or programming. The snap‑action mechanism delivers a crisp on\/off response, reducing chatter and ensuring consistent furnace cycling.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis thermostat is compatible with \u003cstrong\u003eall Suburban RV furnace models\u003c\/strong\u003e, making it a universal replacement for older or worn heat‑only thermostats in travel trailers, fifth wheels, motorhomes, and park models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHeat‑only thermostat\u003c\/strong\u003e for Suburban RV furnaces\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSnap‑action mechanical control\u003c\/strong\u003e for reliable on\/off switching\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eUniversal compatibility\u003c\/strong\u003e with all Suburban furnace models\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNo batteries required\u003c\/strong\u003e — powered by furnace control voltage\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eClean \u003cstrong\u003ewhite housing\u003c\/strong\u003e for modern RV interiors\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSimple two‑wire installation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eWhen Technicians Replace This Thermostat\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFurnace will not turn on or cycles erratically\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTemperature swings or inconsistent heating\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eThermostat contacts sticking or failing to close\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUpgrading from older yellowed or worn thermostats\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCustomer prefers a simple, non‑digital control\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFits ALL Suburban RV furnace models\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWorks with any two‑wire heat‑only RV furnace control circuit\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003c\/h2\u003e","brand":"Laurelhurst","offers":[{"title":"Default Title","offer_id":42493972283458,"sku":"S161154","price":32.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot2025-10-05235015.png?v=1759733620"},{"product_id":"050715-suburban-furnace-duct-collar-4","title":"050715 Suburban Furnace DUCT COLLAR 4”","description":"\u003ch1\u003e050715 Suburban Furnace DUCT COLLAR 4”\u003c\/h1\u003e\n\u003ch3\u003eOEM hot‑air outlet collar for Suburban RV furnaces\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Suburban 050715 duct collar is a \u003cstrong\u003e4‑inch round hot‑air discharge collar\u003c\/strong\u003e used to attach ducting to Suburban RV furnaces. Many Suburban models ship with multiple potential duct ports, and this collar provides the proper mounting interface for a secure, leak‑free connection. A damaged or missing collar can cause heat loss, reduced airflow, and improper static pressure, leading to poor furnace performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis collar is sized for standard 4\" RV furnace ducting and installs directly onto the furnace’s outlet port using the factory mounting holes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eWhat this duct collar does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eProvides a secure 4\" connection point for furnace ducting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintains proper airflow and static pressure\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrevents heat loss into the furnace compartment\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEnsures correct distribution of heated air to registers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSupports both flexible and rigid RV ducting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eTypical use cases\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAdding an additional duct run to a multi‑port furnace\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a damaged, bent, or missing duct collar\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRestoring airflow balance after remodels or service\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEnsuring proper fitment when upgrading ducting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Laurelhurst","offers":[{"title":"Default Title","offer_id":43061516140610,"sku":"S050715","price":5.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/050715.png?v=1772767168"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/collections\/Suburban_NTS_1.jpg?v=1774318635","url":"https:\/\/hvacpartstore.com\/collections\/suburban-nt-12s-nt-16s-nt-20s-parts-breakdown\/duct-collar.oembed","provider":"HVACpartstore","version":"1.0","type":"link"}