{"product_id":"5d51-35-copeland-comfort-control-white-rodgers-fan-limit-5","title":"5D51-35 Copeland Comfort Control (White Rodgers) FAN\/LIMIT  5\"","description":"\u003ch1\u003e5D51-35 Copeland Comfort Control (White Rodgers) FAN\/LIMIT  5\"\u003c\/h1\u003e\n\u003cstyle\u003e\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n\u003c\/style\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003e5D51-35 Fan \u0026amp; Limit Control (White-Rodgers \/ Copeland Comfort Control)\u003c\/strong\u003e is a combination temperature control designed to regulate blower fan operation and provide high-temperature safety protection in residential and light commercial furnaces. Featuring a \u003cstrong\u003e5-inch insertion element\u003c\/strong\u003e, this control automatically starts and stops the blower based on plenum temperature while also protecting the furnace from overheating through its integrated limit switch function.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5D51-35\u003c\/li\u003e\n\u003cli\u003eWhite-Rodgers 5D51-35\u003c\/li\u003e\n\u003cli\u003eCopeland Comfort Control 5D51-35\u003c\/li\u003e\n\u003cli\u003e5D5135\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eDirect OEM\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhite-Rodgers 5D51-35\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCompatible Brands\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhite-Rodgers\u003c\/li\u003e\n\u003cli\u003eEmerson\u003c\/li\u003e\n\u003cli\u003eCopeland\u003c\/li\u003e\n\u003cli\u003eYork\u003c\/li\u003e\n\u003cli\u003eColeman\u003c\/li\u003e\n\u003cli\u003eLuxaire\u003c\/li\u003e\n\u003cli\u003eGoodman\u003c\/li\u003e\n\u003cli\u003eRheem\u003c\/li\u003e\n\u003cli\u003eUniversal Furnace Applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cp\u003eUsed in warm air furnaces to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eControl blower fan operation\u003c\/li\u003e\n\u003cli\u003ePrevent circulation of cold air during startup\u003c\/li\u003e\n\u003cli\u003eMaintain proper furnace temperature control\u003c\/li\u003e\n\u003cli\u003eProvide high-limit overheating protection\u003c\/li\u003e\n\u003cli\u003eAutomatically cycle the blower during heating operation\u003c\/li\u003e\n\u003cli\u003eProtect heat exchangers from excessive temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eRelated Components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFan \u0026amp; Limit Control\u003c\/li\u003e\n\u003cli\u003eHigh Limit Switch\u003c\/li\u003e\n\u003cli\u003eFan Switch\u003c\/li\u003e\n\u003cli\u003eFurnace Control Board\u003c\/li\u003e\n\u003cli\u003eBlower Relay\u003c\/li\u003e\n\u003cli\u003eBlower Motor\u003c\/li\u003e\n\u003cli\u003eTransformer\u003c\/li\u003e\n\u003cli\u003eThermostat\u003c\/li\u003e\n\u003cli\u003eTemperature Control Dial\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnician Notes\u003c\/h3\u003e\n\u003cp\u003eThe 5D51-35 is a \u003cstrong\u003ecombination fan and limit control\u003c\/strong\u003e utilizing a \u003cstrong\u003e5-inch sensing element\u003c\/strong\u003e that extends into the furnace plenum. This design provides both blower control and high-temperature safety protection in a single assembly. Always verify insertion length, mounting dimensions, and temperature settings before replacement.\u003c\/p\u003e\n\u003cp\u003eIf the blower runs continuously, fails to start, or the furnace cycles on high limit, inspect airflow, blower operation, filter condition, and heat exchanger temperatures before condemning the control.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCommon Symptoms of Failure\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlower fan runs continuously\u003c\/li\u003e\n\u003cli\u003eBlower fails to start\u003c\/li\u003e\n\u003cli\u003eFurnace overheats\u003c\/li\u003e\n\u003cli\u003eHigh-limit shutdowns\u003c\/li\u003e\n\u003cli\u003eShort cycling\u003c\/li\u003e\n\u003cli\u003eInconsistent blower operation\u003c\/li\u003e\n\u003cli\u003ePoor airflow during heating\u003c\/li\u003e\n\u003cli\u003eExcessive furnace temperatures\u003c\/li\u003e\n\u003cli\u003eNo heat output\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect power before servicing.\u003c\/li\u003e\n\u003cli\u003eMark all wire locations before removal.\u003c\/li\u003e\n\u003cli\u003eVerify the 5-inch insertion length matches the original control.\u003c\/li\u003e\n\u003cli\u003eSecure the sensing element fully within the plenum.\u003c\/li\u003e\n\u003cli\u003eInspect wiring terminals for corrosion or overheating.\u003c\/li\u003e\n\u003cli\u003eCheck blower motor amperage and operation.\u003c\/li\u003e\n\u003cli\u003eVerify fan and limit settings after installation.\u003c\/li\u003e\n\u003cli\u003eTest the furnace through a complete heating cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch3\u003eRecommended Inspection Items\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlower motor condition\u003c\/li\u003e\n\u003cli\u003eAir filter restriction\u003c\/li\u003e\n\u003cli\u003eHeat exchanger temperature rise\u003c\/li\u003e\n\u003cli\u003eFan relay operation\u003c\/li\u003e\n\u003cli\u003eWiring terminals\u003c\/li\u003e\n\u003cli\u003eFurnace control board\u003c\/li\u003e\n\u003cli\u003eSupply and return airflow\u003c\/li\u003e\n\u003cli\u003eVenting system\u003c\/li\u003e\n\u003cli\u003eBlower wheel cleanliness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\" id=\"features\"\u003e\n\u003cp\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot_2025-11-16_181920_1024x1024.png?v=1763342443\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Quinn","offers":[{"title":"Default Title","offer_id":45558787702850,"sku":"5D51-35","price":227.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/products\/HNYWLL_L4064B2210-U_Image1_8aae51fc-c903-4534-82a3-05cd9bf5aa8e.jpg?v=1739517743","url":"https:\/\/hvacpartstore.com\/products\/5d51-35-copeland-comfort-control-white-rodgers-fan-limit-5","provider":"HVACpartstore","version":"1.0","type":"link"}