{"product_id":"dometic-atwood-rv-furnace-high-temperature-limit-switch","title":"Dometic Atwood Furnace High Temperature Limit Switch - Fits 8500, 8900, 7900 Series - Part# 37021","description":"\u003cdiv class=\"erp-pdp\"\u003e\n\n\u003cp\u003eThe Dometic Atwood High Temperature Limit Switch (Part# 37021) is a critical safety component that protects your RV furnace from overheating. This switch automatically shuts off the furnace if internal temperatures exceed safe operating limits, preventing damage to the heating system and ensuring safe operation. If your Atwood furnace is cycling on and off unexpectedly or won't stay lit, a faulty limit switch is often the culprit.\u003c\/p\u003e\n\n\u003ch2 style=\"font-size:22px;font-weight:800;color:#dc2626;margin:32px 0 16px;padding-bottom:10px;border-bottom:3px solid #dc2626;\"\u003eKey Features\u003c\/h2\u003e\n\u003cul style=\"line-height:1.8;margin-bottom:24px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical Safety Component:\u003c\/strong\u003e Automatically shuts off furnace operation when temperatures exceed safe limits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Dometic OEM Part:\u003c\/strong\u003e Factory replacement part engineered specifically for Atwood furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Exact fit for original equipment - no modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents Furnace Damage:\u003c\/strong\u003e Protects heating elements and internal components from heat-related failure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Diagnosis:\u003c\/strong\u003e Common failure point when furnace won't stay running or cycles erratically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built to withstand repeated thermal cycling in demanding RV environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 style=\"font-size:22px;font-weight:800;color:#dc2626;margin:32px 0 16px;padding-bottom:10px;border-bottom:3px solid #dc2626;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"table table-bordered table-sm\" style=\"margin-bottom:24px;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-weight:600;background:#f8f9fa;width:35%;\"\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e37021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-weight:600;background:#f8f9fa;\"\u003eComponent Type\u003c\/td\u003e\n\u003ctd\u003eHigh Temperature Limit Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-weight:600;background:#f8f9fa;\"\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eAtwood RV Furnaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-weight:600;background:#f8f9fa;\"\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eOverheat Protection \/ Safety Shutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-weight:600;background:#f8f9fa;\"\u003eReplacement Type\u003c\/td\u003e\n\u003ctd\u003eDirect OEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2 style=\"font-size:22px;font-weight:800;color:#dc2626;margin:32px 0 16px;padding-bottom:10px;border-bottom:3px solid #dc2626;\"\u003eCompatible Furnace Models\u003c\/h2\u003e\n\u003ctable class=\"table table-bordered table-sm\" style=\"margin-bottom:24px;\"\u003e\n\u003ctr style=\"background:#f8f9fa;font-weight:600;\"\u003e\n\u003ctd\u003eFurnace Series\u003c\/td\u003e\n\u003ctd\u003eCommon Applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAtwood 8500 Series\u003c\/td\u003e\n\u003ctd\u003e8500-II, 8500-III, 8500-IV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAtwood 8900 Series\u003c\/td\u003e\n\u003ctd\u003e8900-II, 8900-III, 8900-IV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAtwood 7900 Series\u003c\/td\u003e\n\u003ctd\u003e7900-II, 7900-III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"font-size:12px;color:#666;font-style:italic;\"\u003eVerify your furnace model number before ordering to ensure proper fit\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2 style=\"font-size:22px;font-weight:800;color:#dc2626;margin:32px 0 16px;padding-bottom:10px;border-bottom:3px solid #dc2626;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003ch3 style=\"font-size:16px;font-weight:700;color:#333;margin-bottom:8px;\"\u003eHow do I know if my limit switch has failed?\u003c\/h3\u003e\n\u003cp style=\"margin:0;line-height:1.6;color:#666;\"\u003eCommon symptoms include the furnace starting but shutting off after a few seconds, repeated cycling without heating, or the furnace not igniting at all. If the furnace runs briefly then stops, the limit switch may be tripping due to actual overheating or switch failure. Always check for blocked vents and proper airflow before replacing the switch.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003ch3 style=\"font-size:16px;font-weight:700;color:#333;margin-bottom:8px;\"\u003eCan I test the limit switch before replacing it?\u003c\/h3\u003e\n\u003cp style=\"margin:0;line-height:1.6;color:#666;\"\u003eYes, with the furnace off and cooled down, you can use a multimeter to test for continuity across the switch terminals. A functioning switch should show continuity when cool. If there's no continuity at room temperature, the switch has failed in the open position and needs replacement. Always disconnect power before testing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003ch3 style=\"font-size:16px;font-weight:700;color:#333;margin-bottom:8px;\"\u003eIs this switch difficult to replace?\u003c\/h3\u003e\n\u003cp style=\"margin:0;line-height:1.6;color:#666;\"\u003eMost RV owners with basic mechanical skills can replace this switch. It typically involves removing the furnace cover, disconnecting two wire terminals, removing mounting screws, and reversing the process with the new switch. Always turn off power at the breaker and allow the furnace to cool completely before beginning work. Consult your furnace service manual for specific instructions.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003ch3 style=\"font-size:16px;font-weight:700;color:#333;margin-bottom:8px;\"\u003eWhy does my limit switch keep failing?\u003c\/h3\u003e\n\u003cp style=\"margin:0;line-height:1.6;color:#666;\"\u003eRepeated limit switch failures usually indicate an underlying problem causing actual overheating. Check for restricted airflow due to dirty filters, blocked intake or exhaust vents, failed blower motor, or debris inside the furnace chamber. Address these issues to prevent premature failure of the replacement switch.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size:22px;font-weight:800;color:#dc2626;margin:32px 0 16px;padding-bottom:10px;border-bottom:3px solid #dc2626;\"\u003eWhy Choose Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp style=\"line-height:1.8;margin-bottom:16px;\"\u003eAt ElkhartRVParts.com, we specialize in hard-to-find Dometic and Atwood furnace parts that keep your RV heating system running safely and efficiently. Located in Elkhart, Indiana — the RV Capital of the World — we understand the importance of reliable furnace operation, especially during cold-weather camping. We stock genuine OEM replacement parts and ship fast so you can get back to comfortable RVing.\u003c\/p\u003e\n\n\u003cp style=\"line-height:1.8;margin-bottom:16px;\"\u003eOur team knows Atwood furnaces inside and out. Whether you're troubleshooting a heating issue or performing preventive maintenance, we're here to help you find the exact part you need. Every component we sell meets or exceeds original equipment specifications for reliable, long-lasting performance.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #dc2626;padding:16px;margin-top:24px;\"\u003e\n\u003cp style=\"margin:0;font-weight:600;color:#dc2626;\"\u003e✓ Genuine Dometic OEM Parts\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0 0;font-weight:600;color:#dc2626;\"\u003e✓ Fast Shipping from Elkhart, Indiana\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0 0;font-weight:600;color:#dc2626;\"\u003e✓ Expert RV Parts Support\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Dometic","offers":[{"title":"Default Title","offer_id":48317852188824,"sku":"37021","price":36.89,"currency_code":"USD","in_stock":true}],"url":"https:\/\/elkhartrvparts.com\/products\/dometic-atwood-rv-furnace-high-temperature-limit-switch","provider":"Elkhart RV Parts","version":"1.0","type":"link"}