{"product_id":"m-c-enterprises-31093mc-furnace-low-air-flow-switch-sail-switch","title":"M.C. Enterprises 31093MC Furnace Low Air Flow Switch (Sail Switch)","description":"\u003ch2 data-start=\"171\" data-end=\"242\"\u003eM.C. Enterprises 31093MC Furnace Low Air Flow Switch (Sail Switch)\u003c\/h2\u003e\n\u003cp data-start=\"243\" data-end=\"356\"\u003e\u003cstrong data-start=\"243\" data-end=\"326\"\u003eFor Atwood Hydroflame AF Small Series Furnaces – Serial Numbers BEFORE 72498929\u003c\/strong\u003e\u003cbr data-start=\"326\" data-end=\"329\"\u003e\u003cstrong data-start=\"329\" data-end=\"356\"\u003eAftermarket Replacement\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"358\" data-end=\"545\"\u003e\u003cstrong data-start=\"358\" data-end=\"374\"\u003ePart Number:\u003c\/strong\u003e 31093MC\u003cbr data-start=\"382\" data-end=\"385\"\u003e\u003cstrong data-start=\"385\" data-end=\"402\"\u003eManufacturer:\u003c\/strong\u003e M.C. Enterprises\u003cbr data-start=\"419\" data-end=\"422\"\u003e\u003cstrong data-start=\"422\" data-end=\"439\"\u003eProduct Type:\u003c\/strong\u003e Furnace Low Air Flow Switch (Sail Switch)\u003cbr data-start=\"481\" data-end=\"484\"\u003e\u003cstrong data-start=\"484\" data-end=\"500\"\u003eApplication:\u003c\/strong\u003e Atwood HydroFlame AF Small Series Furnaces\u003c\/p\u003e\n\u003chr data-start=\"547\" data-end=\"550\"\u003e\n\u003ch2 data-start=\"552\" data-end=\"571\"\u003eProduct Overview\u003c\/h2\u003e\n\u003cp data-start=\"573\" data-end=\"780\"\u003eThe \u003cstrong data-start=\"577\" data-end=\"633\"\u003eM.C. Enterprises 31093MC Furnace Low Air Flow Switch\u003c\/strong\u003e is an aftermarket sail switch designed specifically for \u003cstrong data-start=\"690\" data-end=\"779\"\u003eAtwood HydroFlame AF small series furnaces manufactured BEFORE serial number 72498929\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"782\" data-end=\"1031\"\u003eAlso known as a \u003cstrong data-start=\"798\" data-end=\"813\"\u003esail switch\u003c\/strong\u003e, this component verifies proper blower airflow before allowing the furnace ignition sequence to begin. If sufficient airflow is not detected, the burner will not ignite — protecting the furnace from unsafe combustion.\u003c\/p\u003e\n\u003cp data-start=\"1033\" data-end=\"1212\"\u003eIf your RV furnace blower runs but no flame appears, ignition is intermittent, or the unit shuts down shortly after startup, a faulty sail switch is one of the most common causes.\u003c\/p\u003e\n\u003cp data-start=\"1214\" data-end=\"1323\"\u003eThe 31093MC provides a reliable and cost-effective replacement for early-production AF small-series furnaces.\u003c\/p\u003e\n\u003chr data-start=\"1325\" data-end=\"1328\"\u003e\n\u003ch2 data-start=\"1330\" data-end=\"1365\"\u003e⚠ Important Compatibility Notice\u003c\/h2\u003e\n\u003cp data-start=\"1367\" data-end=\"1464\"\u003eThis sail switch is \u003cstrong data-start=\"1387\" data-end=\"1464\"\u003eONLY compatible with furnaces manufactured BEFORE Serial Number 72498929.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1466\" data-end=\"1545\"\u003eAlways verify both your furnace model number and serial number before ordering.\u003c\/p\u003e\n\u003chr data-start=\"1547\" data-end=\"1550\"\u003e\n\u003ch1 data-start=\"1552\" data-end=\"1581\"\u003eCompatible Furnace Models\u003c\/h1\u003e\n\u003cp data-start=\"1582\" data-end=\"1647\"\u003e\u003cstrong data-start=\"1582\" data-end=\"1647\"\u003eDometic \/ Atwood Furnaces with Serial Numbers BEFORE 72498929\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"1649\" data-end=\"1652\"\u003e\n\u003ch2 data-start=\"1654\" data-end=\"1668\"\u003eAFMD Series\u003c\/h2\u003e\n\u003cp data-start=\"1670\" data-end=\"1729\"\u003eAFMD16111\u003cbr data-start=\"1679\" data-end=\"1682\"\u003eAFMD16121\u003cbr data-start=\"1691\" data-end=\"1694\"\u003eAFMD16131\u003cbr data-start=\"1703\" data-end=\"1706\"\u003eAFMD16141\u003cbr data-start=\"1715\" data-end=\"1718\"\u003eAFMD16151\u003c\/p\u003e\n\u003cp data-start=\"1731\" data-end=\"1790\"\u003eAFMD20111\u003cbr data-start=\"1740\" data-end=\"1743\"\u003eAFMD20121\u003cbr data-start=\"1752\" data-end=\"1755\"\u003eAFMD20131\u003cbr data-start=\"1764\" data-end=\"1767\"\u003eAFMD20141\u003cbr data-start=\"1776\" data-end=\"1779\"\u003eAFMD20151\u003c\/p\u003e\n\u003chr data-start=\"1792\" data-end=\"1795\"\u003e\n\u003ch2 data-start=\"1797\" data-end=\"1812\"\u003eAFSAD Series\u003c\/h2\u003e\n\u003cp data-start=\"1814\" data-end=\"1865\"\u003eAFSAD12111\u003cbr data-start=\"1824\" data-end=\"1827\"\u003eAFSAD12121\u003cbr data-start=\"1837\" data-end=\"1840\"\u003eAFSAD12131\u003cbr data-start=\"1850\" data-end=\"1853\"\u003eAFSAD12141\u003c\/p\u003e\n\u003chr data-start=\"1867\" data-end=\"1870\"\u003e\n\u003ch2 data-start=\"1872\" data-end=\"1886\"\u003eAFSD Series\u003c\/h2\u003e\n\u003cp data-start=\"1888\" data-end=\"1935\"\u003eAFSD12111\u003cbr data-start=\"1897\" data-end=\"1900\"\u003eAFSD12121\u003cbr data-start=\"1909\" data-end=\"1912\"\u003eAFSD12131\u003cbr data-start=\"1921\" data-end=\"1924\"\u003eAFSD12141\u003c\/p\u003e\n\u003cp data-start=\"1937\" data-end=\"1984\"\u003eAFSD16111\u003cbr data-start=\"1946\" data-end=\"1949\"\u003eAFSD16121\u003cbr data-start=\"1958\" data-end=\"1961\"\u003eAFSD16131\u003cbr data-start=\"1970\" data-end=\"1973\"\u003eAFSD16141\u003c\/p\u003e\n\u003cp data-start=\"1986\" data-end=\"2021\"\u003eAFSD20121\u003cbr data-start=\"1995\" data-end=\"1998\"\u003eAFSD20131\u003cbr data-start=\"2007\" data-end=\"2010\"\u003eAFSD20141\u003c\/p\u003e\n\u003chr data-start=\"2023\" data-end=\"2026\"\u003e\n\u003cblockquote data-start=\"2028\" data-end=\"2115\"\u003e\n\u003cp data-start=\"2030\" data-end=\"2115\"\u003eIf your furnace serial number is AFTER 72498929, a different sail switch is required.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr data-start=\"2117\" data-end=\"2120\"\u003e\n\u003ch2 data-start=\"2122\" data-end=\"2137\"\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli data-start=\"2141\" data-end=\"2205\"\u003eAftermarket replacement for early Atwood small series furnaces\u003c\/li\u003e\n\u003cli data-start=\"2208\" data-end=\"2264\"\u003eDesigned for units manufactured before serial 72498929\u003c\/li\u003e\n\u003cli data-start=\"2267\" data-end=\"2301\"\u003eVerifies airflow before ignition\u003c\/li\u003e\n\u003cli data-start=\"2304\" data-end=\"2352\"\u003eHelps resolve “blower runs but no heat” issues\u003c\/li\u003e\n\u003cli data-start=\"2355\" data-end=\"2392\"\u003eRestores proper ignition sequencing\u003c\/li\u003e\n\u003cli data-start=\"2395\" data-end=\"2436\"\u003eDirect-fit design for compatible models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2438\" data-end=\"2441\"\u003e\n\u003ch2 data-start=\"2443\" data-end=\"2485\"\u003eCommon Symptoms of a Failed Sail Switch\u003c\/h2\u003e\n\u003cp data-start=\"2487\" data-end=\"2530\"\u003eYou may need to replace the sail switch if:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2534\" data-end=\"2580\"\u003eBlower motor runs but burner will not ignite\u003c\/li\u003e\n\u003cli data-start=\"2583\" data-end=\"2626\"\u003eFurnace attempts ignition then shuts down\u003c\/li\u003e\n\u003cli data-start=\"2629\" data-end=\"2659\"\u003eHeating works intermittently\u003c\/li\u003e\n\u003cli data-start=\"2662\" data-end=\"2701\"\u003eAirflow-related ignition faults occur\u003c\/li\u003e\n\u003cli data-start=\"2704\" data-end=\"2749\"\u003ePaddle arm is bent, sticking, or obstructed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2751\" data-end=\"2848\"\u003eThe sail switch is one of the most frequently replaced RV furnace parts in small AF series units.\u003c\/p\u003e\n\u003chr data-start=\"2850\" data-end=\"2853\"\u003e\n\u003ch2 data-start=\"2855\" data-end=\"2880\"\u003eProduct Specifications\u003c\/h2\u003e\n\u003cp data-start=\"2882\" data-end=\"3069\"\u003eManufacturer: M.C. Enterprises\u003cbr data-start=\"2912\" data-end=\"2915\"\u003ePart Number: 31093MC\u003cbr data-start=\"2935\" data-end=\"2938\"\u003eComponent: Low Air Flow Switch (Sail Switch)\u003cbr data-start=\"2982\" data-end=\"2985\"\u003eApplication: AF Small Series (Pre-Serial 72498929)\u003cbr data-start=\"3035\" data-end=\"3038\"\u003eType: Aftermarket Replacement\u003c\/p\u003e\n\u003chr data-start=\"3071\" data-end=\"3074\"\u003e\n\u003ch2 data-start=\"3076\" data-end=\"3111\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp data-start=\"3113\" data-end=\"3263\"\u003e\u003cstrong data-start=\"3113\" data-end=\"3154\"\u003eQ: Why does the serial number matter?\u003c\/strong\u003e\u003cbr data-start=\"3154\" data-end=\"3157\"\u003eA: Furnace airflow switch designs changed after serial number 72498929, requiring a different sail switch.\u003c\/p\u003e\n\u003cp data-start=\"3265\" data-end=\"3385\"\u003e\u003cstrong data-start=\"3265\" data-end=\"3330\"\u003eQ: Will this fit AFSD furnaces made after that serial number?\u003c\/strong\u003e\u003cbr data-start=\"3330\" data-end=\"3333\"\u003eA: No. Later models require a different part number.\u003c\/p\u003e\n\u003cp data-start=\"3387\" data-end=\"3481\"\u003e\u003cstrong data-start=\"3387\" data-end=\"3421\"\u003eQ: What does a sail switch do?\u003c\/strong\u003e\u003cbr data-start=\"3421\" data-end=\"3424\"\u003eA: It verifies adequate airflow before allowing ignition.\u003c\/p\u003e\n\u003cp data-start=\"3483\" data-end=\"3596\"\u003e\u003cstrong data-start=\"3483\" data-end=\"3518\"\u003eQ: Is this an OEM Dometic part?\u003c\/strong\u003e\u003cbr data-start=\"3518\" data-end=\"3521\"\u003eA: No. This is an aftermarket replacement manufactured by M.C. Enterprises.\u003c\/p\u003e","brand":"RV Furnace Guys","offers":[{"title":"Default Title","offer_id":47857561862385,"sku":null,"price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4941\/0289\/files\/31093SailMC.jpg?v=1772393605","url":"https:\/\/www.rvfurnaceparts.com\/products\/m-c-enterprises-31093mc-furnace-low-air-flow-switch-sail-switch","provider":"RV Furnace Guys","version":"1.0","type":"link"}