{"product_id":"m-c-enterprises-31377mc-furnace-low-air-flow-switch-sail-switch","title":"M.C. Enterprises 31377MC Furnace Low Air Flow Switch (Sail Switch)","description":"\u003ch2 data-start=\"167\" data-end=\"238\"\u003eM.C. Enterprises 31377MC Furnace Low Air Flow Switch (Sail Switch)\u003c\/h2\u003e\n\u003cp data-start=\"239\" data-end=\"293\"\u003e\u003cstrong data-start=\"239\" data-end=\"293\"\u003eAftermarket Replacement for Dometic \/ Atwood 31377\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"295\" data-end=\"478\"\u003e\u003cstrong data-start=\"295\" data-end=\"311\"\u003ePart Number:\u003c\/strong\u003e 31377MC\u003cbr data-start=\"319\" data-end=\"322\"\u003e\u003cstrong data-start=\"322\" data-end=\"335\"\u003eReplaces:\u003c\/strong\u003e Dometic \/ Atwood 31377\u003cbr data-start=\"358\" data-end=\"361\"\u003e\u003cstrong data-start=\"361\" data-end=\"378\"\u003eProduct Type:\u003c\/strong\u003e Furnace Low Air Flow Switch (Sail Switch)\u003cbr data-start=\"420\" data-end=\"423\"\u003e\u003cstrong data-start=\"423\" data-end=\"439\"\u003eApplication:\u003c\/strong\u003e Atwood \u0026amp; Dometic HydroFlame Furnaces\u003c\/p\u003e\n\u003chr data-start=\"480\" data-end=\"483\"\u003e\n\u003ch2 data-start=\"485\" data-end=\"504\"\u003eProduct Overview\u003c\/h2\u003e\n\u003cp data-start=\"506\" data-end=\"665\"\u003eThe \u003cstrong data-start=\"510\" data-end=\"566\"\u003eM.C. Enterprises 31377MC Furnace Low Air Flow Switch\u003c\/strong\u003e is a high-quality aftermarket replacement designed to replace \u003cstrong data-start=\"629\" data-end=\"664\"\u003eDometic \/ Atwood OEM Part 31377\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"667\" data-end=\"900\"\u003eAlso known as a \u003cstrong data-start=\"683\" data-end=\"698\"\u003esail switch\u003c\/strong\u003e, this component verifies adequate blower airflow before permitting the furnace ignition sequence. If proper airflow is not detected, the switch prevents ignition to protect against improper combustion.\u003c\/p\u003e\n\u003cp data-start=\"902\" data-end=\"1066\"\u003eIf your RV furnace blower runs but the burner will not ignite, cycles erratically, or shuts down prematurely, a failed sail switch is one of the most common causes.\u003c\/p\u003e\n\u003cp data-start=\"1068\" data-end=\"1224\"\u003eReplacing your original 31377 sail switch with the 31377MC restores proper ignition sequencing, stable airflow monitoring, and reliable heating performance.\u003c\/p\u003e\n\u003cp data-start=\"1226\" data-end=\"1390\"\u003eManufactured by M.C. Enterprises, this component provides dependable performance and direct-fit compatibility for a wide range of Atwood and Dometic furnace models.\u003c\/p\u003e\n\u003chr data-start=\"1392\" data-end=\"1395\"\u003e\n\u003ch2 data-start=\"1397\" data-end=\"1412\"\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli data-start=\"1416\" data-end=\"1475\"\u003eDirect aftermarket replacement for Dometic \/ Atwood 31377\u003c\/li\u003e\n\u003cli data-start=\"1478\" data-end=\"1512\"\u003eVerifies airflow before ignition\u003c\/li\u003e\n\u003cli data-start=\"1515\" data-end=\"1563\"\u003eHelps resolve “blower runs but no heat” issues\u003c\/li\u003e\n\u003cli data-start=\"1566\" data-end=\"1603\"\u003eRestores proper ignition sequencing\u003c\/li\u003e\n\u003cli data-start=\"1606\" data-end=\"1655\"\u003eDirect-fit design for compatible furnace models\u003c\/li\u003e\n\u003cli data-start=\"1658\" data-end=\"1693\"\u003eCost-effective alternative to OEM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1695\" data-end=\"1698\"\u003e\n\u003ch1 data-start=\"1700\" data-end=\"1727\"\u003eCompatible Furnace Models\u003c\/h1\u003e\n\u003chr data-start=\"1729\" data-end=\"1732\"\u003e\n\u003ch2 data-start=\"1734\" data-end=\"1758\"\u003e7900 \u0026amp; 7900-II Series\u003c\/h2\u003e\n\u003cp data-start=\"1760\" data-end=\"1776\"\u003e7912\u003cbr data-start=\"1764\" data-end=\"1767\"\u003e7912-II\u003c\/p\u003e\n\u003cp data-start=\"1778\" data-end=\"1794\"\u003e7916\u003cbr data-start=\"1782\" data-end=\"1785\"\u003e7916-II\u003c\/p\u003e\n\u003cp data-start=\"1796\" data-end=\"1812\"\u003e7920\u003cbr data-start=\"1800\" data-end=\"1803\"\u003e7920-II\u003c\/p\u003e\n\u003chr data-start=\"1814\" data-end=\"1817\"\u003e\n\u003ch2 data-start=\"1819\" data-end=\"1833\"\u003e8500 Series\u003c\/h2\u003e\n\u003cp data-start=\"1835\" data-end=\"1872\"\u003e8516\u003cbr data-start=\"1839\" data-end=\"1842\"\u003e8516-II\u003cbr data-start=\"1849\" data-end=\"1852\"\u003e8516-III\u003cbr data-start=\"1860\" data-end=\"1863\"\u003e8516-IV\u003c\/p\u003e\n\u003cp data-start=\"1874\" data-end=\"1911\"\u003e8520\u003cbr data-start=\"1878\" data-end=\"1881\"\u003e8520-II\u003cbr data-start=\"1888\" data-end=\"1891\"\u003e8520-III\u003cbr data-start=\"1899\" data-end=\"1902\"\u003e8520-IV\u003c\/p\u003e\n\u003cp data-start=\"1913\" data-end=\"1950\"\u003e8525\u003cbr data-start=\"1917\" data-end=\"1920\"\u003e8525-II\u003cbr data-start=\"1927\" data-end=\"1930\"\u003e8525-III\u003cbr data-start=\"1938\" data-end=\"1941\"\u003e8525-IV\u003c\/p\u003e\n\u003cp data-start=\"1952\" data-end=\"1989\"\u003e8531\u003cbr data-start=\"1956\" data-end=\"1959\"\u003e8531-II\u003cbr data-start=\"1966\" data-end=\"1969\"\u003e8531-III\u003cbr data-start=\"1977\" data-end=\"1980\"\u003e8531-IV\u003c\/p\u003e\n\u003cp data-start=\"1991\" data-end=\"2028\"\u003e8535\u003cbr data-start=\"1995\" data-end=\"1998\"\u003e8535-II\u003cbr data-start=\"2005\" data-end=\"2008\"\u003e8535-III\u003cbr data-start=\"2016\" data-end=\"2019\"\u003e8535-IV\u003c\/p\u003e\n\u003chr data-start=\"2030\" data-end=\"2033\"\u003e\n\u003ch2 data-start=\"2035\" data-end=\"2049\"\u003e8900 Series\u003c\/h2\u003e\n\u003ch3 data-start=\"2051\" data-end=\"2066\"\u003e8935 Models\u003c\/h3\u003e\n\u003cp data-start=\"2067\" data-end=\"2144\"\u003e8935-DC-I\u003cbr data-start=\"2076\" data-end=\"2079\"\u003e8935-AC-I\u003cbr data-start=\"2088\" data-end=\"2091\"\u003e8935-DC-II\u003cbr data-start=\"2101\" data-end=\"2104\"\u003e8935-AC-II\u003cbr data-start=\"2114\" data-end=\"2117\"\u003e8935-DC-III\u003cbr data-start=\"2128\" data-end=\"2131\"\u003e8935-AC-III\u003c\/p\u003e\n\u003ch3 data-start=\"2146\" data-end=\"2161\"\u003e8940 Models\u003c\/h3\u003e\n\u003cp data-start=\"2162\" data-end=\"2239\"\u003e8940-DC-I\u003cbr data-start=\"2171\" data-end=\"2174\"\u003e8940-AC-I\u003cbr data-start=\"2183\" data-end=\"2186\"\u003e8940-DC-II\u003cbr data-start=\"2196\" data-end=\"2199\"\u003e8940-AC-II\u003cbr data-start=\"2209\" data-end=\"2212\"\u003e8940-DC-III\u003cbr data-start=\"2223\" data-end=\"2226\"\u003e8940-AC-III\u003c\/p\u003e\n\u003chr data-start=\"2241\" data-end=\"2244\"\u003e\n\u003cblockquote data-start=\"2246\" data-end=\"2346\"\u003e\n\u003cp data-start=\"2248\" data-end=\"2346\"\u003eAlways verify your furnace model number and confirm it originally used Part 31377 before ordering.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr data-start=\"2348\" data-end=\"2351\"\u003e\n\u003ch2 data-start=\"2353\" data-end=\"2396\"\u003eWhen Should You Replace the Sail Switch?\u003c\/h2\u003e\n\u003cp data-start=\"2398\" data-end=\"2441\"\u003eYou may need to replace the sail switch if:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2445\" data-end=\"2491\"\u003eBlower motor runs but burner does not ignite\u003c\/li\u003e\n\u003cli data-start=\"2494\" data-end=\"2537\"\u003eFurnace attempts ignition then shuts down\u003c\/li\u003e\n\u003cli data-start=\"2540\" data-end=\"2565\"\u003eHeating is intermittent\u003c\/li\u003e\n\u003cli data-start=\"2568\" data-end=\"2601\"\u003eAirflow-related shutdown occurs\u003c\/li\u003e\n\u003cli data-start=\"2604\" data-end=\"2644\"\u003ePaddle is stuck, bent, or contaminated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2646\" data-end=\"2725\"\u003eThe sail switch is one of the most common service parts in HydroFlame furnaces.\u003c\/p\u003e\n\u003chr data-start=\"2727\" data-end=\"2730\"\u003e\n\u003ch2 data-start=\"2732\" data-end=\"2757\"\u003eProduct Specifications\u003c\/h2\u003e\n\u003cp data-start=\"2759\" data-end=\"2978\"\u003eManufacturer: M.C. Enterprises\u003cbr data-start=\"2789\" data-end=\"2792\"\u003ePart Number: 31377MC\u003cbr data-start=\"2812\" data-end=\"2815\"\u003eReplaces: Dometic \/ Atwood 31377\u003cbr data-start=\"2847\" data-end=\"2850\"\u003eComponent: Low Air Flow Switch (Sail Switch)\u003cbr data-start=\"2894\" data-end=\"2897\"\u003eApplication: 7900, 8500 \u0026amp; 8900 Series Furnaces\u003cbr data-start=\"2943\" data-end=\"2946\"\u003eIncludes: Sail switch assembly\u003c\/p\u003e\n\u003chr data-start=\"2980\" data-end=\"2983\"\u003e\n\u003ch2 data-start=\"2985\" data-end=\"3020\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp data-start=\"3022\" data-end=\"3164\"\u003e\u003cstrong data-start=\"3022\" data-end=\"3057\"\u003eQ: Is this an OEM Dometic part?\u003c\/strong\u003e\u003cbr data-start=\"3057\" data-end=\"3060\"\u003eA: No. This is an aftermarket replacement manufactured by M.C. Enterprises that replaces OEM part 31377.\u003c\/p\u003e\n\u003cp data-start=\"3166\" data-end=\"3272\"\u003e\u003cstrong data-start=\"3166\" data-end=\"3200\"\u003eQ: What does a sail switch do?\u003c\/strong\u003e\u003cbr data-start=\"3200\" data-end=\"3203\"\u003eA: It confirms adequate airflow before allowing the burner to ignite.\u003c\/p\u003e\n\u003cp data-start=\"3274\" data-end=\"3422\"\u003e\u003cstrong data-start=\"3274\" data-end=\"3348\"\u003eQ: Will this fix a furnace where the blower runs but no flame appears?\u003c\/strong\u003e\u003cbr data-start=\"3348\" data-end=\"3351\"\u003eA: A failed sail switch is one of the most common causes of that issue.\u003c\/p\u003e\n\u003cp data-start=\"3424\" data-end=\"3573\"\u003e\u003cstrong data-start=\"3424\" data-end=\"3477\"\u003eQ: Is this compatible with both AC and DC models?\u003c\/strong\u003e\u003cbr data-start=\"3477\" data-end=\"3480\"\u003eA: Yes, as listed above, it fits applicable AC and DC 8900 models that originally used 31377.\u003c\/p\u003e","brand":"RV Furnace Guys","offers":[{"title":"Default Title","offer_id":47857554161905,"sku":null,"price":12.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4941\/0289\/files\/31377sailswitchMC.jpg?v=1772392704","url":"https:\/\/rvfurnaceguys.com\/products\/m-c-enterprises-31377mc-furnace-low-air-flow-switch-sail-switch","provider":"RV Furnace Guys","version":"1.0","type":"link"}