{"title":"Furnace Switch","description":null,"products":[{"product_id":"20162904-furnace-primary-limit-switch-150f-to-110f","title":"20162904 Furnace Primary Limit Switch (150°F to 110°F) - For Goodman Furnace","description":"\u003ch2\u003e20162904 Furnace Primary Limit Switch\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTemperature Range: Opens at 150°F (65.5°C) and closes at 110°F (43.3°C).\u003c\/li\u003e\n\u003cli\u003eFunction: Monitors plenum temperature and automatically shuts down the furnace if it exceeds the high limit, preventing overheating.\u003c\/li\u003e\n\u003cli\u003eConstruction: Made from aluminum alloy and thermoplastic materials for durability and reliable conductivity.\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit temperature control switch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e20162904\u003c\/li\u003e\n\u003cli\u003e20162904S\u003c\/li\u003e\n\u003cli\u003eL40-524\u003c\/li\u003e\n\u003cli\u003eL40524\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for use in various Goodman brand furnaces.\u003c\/li\u003e\n\u003cli\u003eVerify the part number in your appliance's service manual to ensure proper fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe furnace cycles on and off frequently without reaching the set temperature.\u003c\/li\u003e\n\u003cli\u003eThe indoor blower motor runs continuously.\u003c\/li\u003e\n\u003cli\u003eThe furnace fails to ignite or produce heat.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect all electrical power to the furnace before servicing.\u003c\/li\u003e\n\u003cli\u003eConfirm the temperature ratings of the replacement switch match the original part.\u003c\/li\u003e\n\u003cli\u003eNote the position of the electrical connections before removing the old switch.\u003c\/li\u003e\n\u003cli\u003eInstallation by a qualified service technician is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45844237254845,"sku":"AZ00211289","price":14.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00211289_1_f29a5e05-166e-4352-9ffd-3f3df9f5c493.jpg?v=1762245686"},{"product_id":"l21020f-furnace-primary-limit-switch-40f-to-180f","title":"L210-20F Furnace Primary Limit Switch (-40°F to 180°F) - For ICP Heil Tempstar Furnaces","description":"\u003ch2\u003eL210-20F Primary Furnace Limit Switch\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCritical safety switch designed to shut down the gas valve and burner circuit if the furnace heat exchanger exceeds maximum safe operating temperatures.\u003c\/li\u003e\n\u003cli\u003eThermal setting calibrated to automatically open the circuit on temperature rise at 210°F and close (reset) at 190°F.\u003c\/li\u003e\n\u003cli\u003eConstructed with a highly responsive bimetallic disc enclosed in a temperature-resistant phenolic housing to prevent heat distortion.\u003c\/li\u003e\n\u003cli\u003eFeatures a flush-mount bracket and standard 1\/4-inch male quick-connect spade terminals for immediate electrical integration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003eL210-20F\u003c\/li\u003e\n\u003cli\u003e34335001\u003c\/li\u003e\n\u003cli\u003e34335-001\u003c\/li\u003e\n\u003cli\u003eHQ34335001TD\u003c\/li\u003e\n\u003cli\u003e313408\u003c\/li\u003e\n\u003cli\u003e338085-758\u003c\/li\u003e\n\u003cli\u003e47-25349-06\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with select residential gas furnaces manufactured by International Comfort Products (ICP), Heil, and Tempstar.\u003c\/li\u003e\n\u003cli\u003eFits specific furnace models including: GDE050B12A2, GDE050B12G1, and GDE075F16A3.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe furnace continuously short-cycles, shutting off the burner assembly well before reaching the target thermostat temperature.\u003c\/li\u003e\n\u003cli\u003eThe furnace blower fan runs non-stop blowing cold air, indicating the system is locked out due to an open limit circuit.\u003c\/li\u003e\n\u003cli\u003eThe main control board diagnostic LED continuously flashes an error code specifically for an open high-limit switch.\u003c\/li\u003e\n\u003cli\u003eA continuity test performed with a digital multimeter displays infinite resistance (an open circuit) while the switch is resting at room temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTurn off the main electrical breaker to the furnace and ensure the unit is completely powered down before opening the service panels.\u003c\/li\u003e\n\u003cli\u003eTake a digital photograph of the existing wire connections to ensure the leads are routed back to the correct spade terminals.\u003c\/li\u003e\n\u003cli\u003eRemove the two hex screws securing the original switch to the heat exchanger bulkhead and carefully pull the component straight out.\u003c\/li\u003e\n\u003cli\u003eAlign the new limit switch flush against the mounting surface and tighten the screws down evenly to prevent bending the mounting plate.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45844237320381,"sku":"AZ00237947","price":20.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00237947_1_ffba4dd1-cc06-4ab4-aee6-48f70fd24800.jpg?v=1762245685"},{"product_id":"87f16-furnace-primary-limit-switch-up-to-140f","title":"87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3","description":"\u003ch2\u003e87F16 Furnace Primary Limit Switch up to 140°F\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePrimary high-limit safety control for forced-air furnaces\u003c\/li\u003e\n\u003cli\u003eActivates at a fixed temperature of 140°F (60°C) to prevent overheating\u003c\/li\u003e\n\u003cli\u003eAutomatically resets at 110°F (43°C)\u003c\/li\u003e\n\u003cli\u003eSwitch configuration: SPST (Single Pole, Single Throw), normally open contacts\u003c\/li\u003e\n\u003cli\u003eProbe insertion length: 3 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e87F16\u003c\/li\u003e\n\u003cli\u003e87F1601\u003c\/li\u003e\n\u003cli\u003eL140-30F\u003c\/li\u003e\n\u003cli\u003eL140F-40\u003c\/li\u003e\n\u003cli\u003e36T01B3\u003c\/li\u003e\n\u003cli\u003e42155\u003c\/li\u003e\n\u003cli\u003eA1247\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned as a direct replacement for specific Lennox brand furnaces.\u003c\/li\u003e\n\u003cli\u003eVerify fitment by confirming the part number on your original switch or in your equipment's service manual.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace blower runs continuously after the heating cycle has stopped.\u003c\/li\u003e\n\u003cli\u003eHeating system short-cycles or shuts down prematurely.\u003c\/li\u003e\n\u003cli\u003eFurnace fails to produce heat or ignite the burners.\u003c\/li\u003e\n\u003cli\u003eControl board displays a fault code indicating an open limit switch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect all electrical power to the furnace before servicing.\u003c\/li\u003e\n\u003cli\u003eLocate the limit switch, typically mounted on the furnace plenum near the heat exchanger.\u003c\/li\u003e\n\u003cli\u003eNote wire connections before removing the old switch.\u003c\/li\u003e\n\u003cli\u003eInstall the new switch, secure it with the mounting screws, and reconnect the wires to the terminals.\u003c\/li\u003e\n\u003cli\u003eRestore power and test the furnace through a complete heating cycle to ensure proper operation.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45844237353149,"sku":"AZ00638885","price":20.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00638885_1_0d1a3ffb-8997-4ab8-873f-5f1bd756a87f.jpg?v=1762245684"},{"product_id":"33082-sail-switch-with-bracket-2pack","title":"33082 Sail Switch with Bracket - For Dometic Atwood RV Furnace Sail Switch - SVC Df Sail Sw W\/Brkt M\/L Kit - 2 Pack","description":"\u003ch2\u003e33082 Sail Switch with Bracket\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow Safety Sensing:\u003c\/strong\u003e Designed to detect sufficient blower motor speed by reacting to the \"wind\" (airflow) inside the furnace; if the sail does not move, the furnace will not ignite, preventing overheating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Microswitch:\u003c\/strong\u003e Features a high-sensitivity internal switch that closes the circuit only when the blower reaches the RPM threshold required for safe combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Bracket:\u003c\/strong\u003e Includes a pre-attached metal mounting bracket designed for a direct fit, ensuring the switch is positioned at the optimal angle within the air plenum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Temperature Housing:\u003c\/strong\u003e The switch body is constructed from heat-stabilized materials to maintain electrical integrity within the intense thermal environment of an RV furnace.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Large Sail:\u003c\/strong\u003e Features the \"Large Sail\" design (M\/L Kit) to ensure reliable engagement even in systems with slightly reduced airflow or older blower motors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e33082\u003c\/li\u003e\n\u003cli\u003e36165\u003c\/li\u003e\n\u003cli\u003e4471008700\u003c\/li\u003e\n\u003cli\u003e33063\u003c\/li\u003e\n\u003cli\u003e31094\u003c\/li\u003e\n\u003cli\u003e31094MC\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis sail switch is a standard replacement for many Dometic and Atwood RV furnaces. Key compatible series include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAtwood\/Dometic DF Series:\u003c\/strong\u003e DFMD20, DFMD25, DFMD30, DFMD35 (Medium\/Large).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAtwood\/Dometic AF Series:\u003c\/strong\u003e AFMD20, AFMD25, AFMD30, AFMD35.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall Furnace Compatibility:\u003c\/strong\u003e While primarily for Medium\/Large (M\/L) models, it replaces switches in many newer Dometic digital-controlled furnaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Not compatible with older \"Hydro Flame\" 8500-IV series furnaces that use the smaller, square sail design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlower Runs but No Heat:\u003c\/strong\u003e The furnace fan turns on, but you never hear the \"click\" of the gas valve or the \"tick-tick-tick\" of the igniter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermittent Ignition:\u003c\/strong\u003e The furnace sometimes lights but often fails, which can be caused by a bent sail or a weak internal microswitch spring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical Damage:\u003c\/strong\u003e The thin metal sail is bent, crimped, or missing, preventing it from catching enough air to move the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLint\/Debris Build-up:\u003c\/strong\u003e Excessive dust or pet hair has clogged the switch pivot point, making the sail too \"heavy\" to move under normal blower pressure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessing the Switch:\u003c\/strong\u003e Most modern DF series furnaces require removing the exterior access cover; the sail switch is typically located on the side of the blower housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrientation:\u003c\/strong\u003e Note the direction of the old sail before removal. The \"sail\" (the thin metal flap) must be facing \u003cstrong\u003einto\u003c\/strong\u003e the path of the blower air.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Connections:\u003c\/strong\u003e The two wires can generally be connected to either terminal on the switch, as it is a simple \"normally open\" circuit that closes when air pushes the sail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Check:\u003c\/strong\u003e Once mounted, gently push the sail with your finger to ensure it moves freely and clicks the microswitch without hitting the sides of the mounting slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest the Blower:\u003c\/strong\u003e If a new switch doesn't fix the issue, check your battery voltage or blower motor speed; if the motor is spinning too slowly, it won't produce enough air to move even a brand-new sail switch.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":46497317683389,"sku":"AZ00183032","price":16.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00247757_1.jpg?v=1764142459"}],"url":"https:\/\/bluestarspartstrend.com\/collections\/furnace-switch.oembed","provider":"BlueStars Parts","version":"1.0","type":"link"}