{"title":"Lennox Furnace Flame Sensors | Genuine OEM Replacement Flame Rods","description":"","products":[{"product_id":"52w29-lennox-lb-74940a-flame-sensor-kit-straight-probe","title":"52W29 Lennox LB-74940A, Flame Sensor Kit, Straight Probe","description":"\u003ch1\u003e\u003cstrong\u003eLennox P\/N 52W29 (LB-74940A) – Genuine OEM Straight Flame Sensor Kit\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eLennox 52W29 \u003c\/strong\u003e(also known as Catalog Number \u003cstrong\u003e52W29\u003c\/strong\u003e and Manufacturer Part Number \u003cstrong\u003eLB-74940A\u003c\/strong\u003e) is a genuine OEM straight \u003cstrong\u003eflame sensor \u003c\/strong\u003edesigned\u003cstrong\u003e \u003c\/strong\u003efor a wide range of Lennox, Allied, Armstrong, Concord, and Ducane gas furnaces. This critical safety component continuously monitors the presence of a flame within the combustion chamber. If the control board does not receive this signal, it safely shuts off the gas flow, preventing the buildup of unburned gas and maintaining system safety.\u003c\/p\u003e\n\u003cp\u003eBeing a Genuine \u003cstrong\u003eOEM \u003c\/strong\u003epart from Lennox ensures optimal \u003cstrong\u003ecompatibility \u003c\/strong\u003eand \u003cstrong\u003ereliability\u003c\/strong\u003e. Unlike universal alternatives, this sensor is built with high-temperature resistant materials (a rod capable of withstanding up to \u003cstrong\u003e2190°F\u003c\/strong\u003e) to the exact specifications required by the furnace's safety circuits. This precision fit and validated functionality are crucial for preventing nuisance shutdowns and ensuring dependable, long-term performance across compatible G40, G50, and G60 series furnaces.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccurate Flame Detection:\u003c\/strong\u003e Precisely monitors the burner flame signal to confirm successful ignition and continuous combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Reliability:\u003c\/strong\u003e Official part from Lennox, ensuring perfect fitment and validated functionality for compatible units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable, High-Temp Construction:\u003c\/strong\u003e Built to withstand demanding combustion environments, operating in temperatures up to 2190°F.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-Fit Design:\u003c\/strong\u003e Features a straight rod design and a standard 1\/4\" male spade terminal for easy, direct installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number: \u003c\/strong\u003e52W29\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Flame Sensor Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number:\u003c\/strong\u003e 52W29\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\/Part #:\u003c\/strong\u003e LB-74940A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRod Length:\u003c\/strong\u003e 2.75\" (2-3\/4\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Length:\u003c\/strong\u003e Approx. 5.25\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 0.114 in (Probe Diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination:\u003c\/strong\u003e 1\/4\" Male Spade Quick Disconnect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Temperature:\u003c\/strong\u003e 2190°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Shipping Weight: \u003c\/strong\u003e 1.5 LB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: Clean Before You Replace\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe most frequent cause of a furnace fault code related to the flame sensor (symptoms include the furnace lighting and then shutting off quickly) is carbon buildup on the sensor rod. Before replacing the 52W29, always try cleaning the existing rod with fine steel wool or an emery cloth. This simple maintenance step often restores the proper micro-amp signal, potentially fixing the issue without needing a new part.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eThe 52W29 is a direct OEM replacement for the following part numbers:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eOEM Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\n52W29, 52W2901, 31L71, 31L7101, LB-74940A, LB47940A.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eCross-Refs: \u003c\/strong\u003e\u003c\/h3\u003e\n28PV41, FLS52W29.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eNote: Use 'CTRL+F' to search for your specific model:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox G40 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nG40DF-24A\/36A\/36B\/48B\/48C (Various Revisions).\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox G41UF Series: \u003c\/strong\u003e\u003c\/h3\u003e\nG41UF-45, -70, -90, -110, -135 (Various Revisions).\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox G43UF Series:\u003c\/strong\u003e\u003c\/h3\u003e\nG43UF-45, -70, -90, -90H, -110, -110H, -135 (Various Revisions).\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox G50, G51 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nG50DF-45\/70\/90\/110\/135 (and X variants).\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox G60, G61, G71 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nG60UH-48B-090X (and various G61 \u0026amp; G71 models).\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52451488596331,"sku":"52W29","price":45.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/original_ac4a1fbf-4ad6-4cd3-b521-02286111b9f0.png?v=1760124050"},{"product_id":"lennox-flame-sensor-790-801a1-1","title":"Lennox 69W43 LB-74940B Flame Sensor Kit Angled Probe OEM Replacement","description":"\u003cp\u003eThe \u003cstrong\u003eLennox 69W43 Flame Sensor Kit\u003c\/strong\u003e serves as the vital \"safety brain\" for your furnace's combustion system, utilizing flame rectification technology to verify a successful ignition. This specific angled-probe design is engineered to sit precisely within the burner’s flame path, sending a microamp signal to the control board to confirm it is safe to keep the gas valve open. If the sensor fails to detect heat due to oxidation or cracks in the ceramic, the system will immediately shut down to prevent unburned gas from accumulating. This kit is a primary support component for high-efficiency \u003cstrong\u003eLennox G24, G32, and G26\u003c\/strong\u003e series furnaces, ensuring reliable operation through the coldest winter cycles.\u003c\/p\u003e\n\u003cp\u003eKey Features\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision OEM Part Number:\u003c\/strong\u003e A direct factory-authorized replacement for \u003cstrong\u003e69W43\u003c\/strong\u003e (LB-74940B), ensuring the angled probe geometry and mounting bracket match your burner box perfectly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngled Probe Design:\u003c\/strong\u003e Specifically shaped to reach into the optimal \"sweet spot\" of the burner flame, preventing nuisance lockouts caused by poor signal strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Safety Monitoring:\u003c\/strong\u003e Provides the high-sensitivity feedback required by the furnace \"brain\" to maintain a continuous, safe heating cycle without short-cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability-Focused Construction:\u003c\/strong\u003e Features a high-grade Kanthal metal probe and a reinforced ceramic insulator designed to withstand extreme thermal expansion and contraction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Replacement Solution:\u003c\/strong\u003e This kit replaces aging or pitted sensors that can no longer be cleaned, restoring the factory-spec microamp signal for consistent ignition.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProduct Details\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Lennox \/ Allied Air\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox Industries\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart #:\u003c\/strong\u003e LB-74940B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCat #:\u003c\/strong\u003e 69W43\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\/SKU:\u003c\/strong\u003e 662551372652 \/ 69W43\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.20 Pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e Low Voltage (Microamp signal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Type:\u003c\/strong\u003e Angled Single Prong\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type:\u003c\/strong\u003e Hot Surface Ignition (HSI) and Spark Ignition compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e🛠️ HVAC Depot Pro Tip\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTake a Picture First!\u003c\/strong\u003e Before removing the old sensor, photograph the exact orientation of the angled probe and the wire lead connection. If the new sensor is installed even slightly \"canted,\" the flame might not fully engulf the probe, leading to an intermittent \"No Flame Sensed\" error code. \u003cstrong\u003eDiagnostic Check:\u003c\/strong\u003e If your furnace starts and then dies after 3 to 5 seconds, it is almost certainly a flame sensor issue. While you can sometimes clean a sensor with a light abrasive in an emergency, once the metal becomes porous or \"pitted,\" it must be replaced to ensure the control board receives a steady, reliable signal.\u003c\/p\u003e\n\u003cp\u003eCross-Reference\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperseded \/ Legacy:\u003c\/strong\u003e 69W4301, 18L18, 18L1801, 100523-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawing Numbers:\u003c\/strong\u003e LB-74940B, 614278-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite-Rodgers\/Emerson Equivalents:\u003c\/strong\u003e 760-401 (Adapter may be required)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther Identifiers:\u003c\/strong\u003e PSE-L18, 69W43-LEN\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eModel Compatibility\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eG24 Series\u003c\/strong\u003e (Suffixes: UH, DF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG26 Series\u003c\/strong\u003e (Suffixes: UH, DF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG32 Series\u003c\/strong\u003e (Suffixes: V, UH)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG40 Series\u003c\/strong\u003e (Suffixes: UH, DF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG41 Series\u003c\/strong\u003e (Suffixes: UF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG51 Series\u003c\/strong\u003e (Suffixes: MPV)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52451506094443,"sku":"66255141489","price":87.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/69W43_7b3b12cd-cd80-4dea-965e-786707b76ba3.jpg?v=1773349579"},{"product_id":"lennox-flame-sensor-44l48-direct-replacement-for-lennox-furnaces","title":"Lennox-Flame Sensor 44L48-Direct Replacement for Lennox Furnaces","description":"\u003ch1\u003e\u003cstrong\u003eLennox P\/N 44L48 – Genuine OEM Angled Flame Sensor\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Lennox \u003cstrong\u003e44L48 \u003c\/strong\u003eis a genuine \u003cstrong\u003eOEM \u003c\/strong\u003eangled \u003cstrong\u003eflame sensor\u003c\/strong\u003e that is a critical safety component in a variety of Lennox gas furnaces and unit heaters, including specific \u003cstrong\u003eGCS16 \u003c\/strong\u003eand \u003cstrong\u003eGCS20 \u003c\/strong\u003emodels. It continuously monitors the presence of the burner flame in the combustion chamber. If the control system does not detect a consistent flame, this sensor signals an immediate shutdown of the gas supply, which prevents the accumulation of unburned gas and ensures the safe operation of the heating system.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eBeing a Genuine \u003cstrong\u003eOEM \u003c\/strong\u003epart from Lennox is vital for reliable and safe operation. This sensor is constructed with durable, high-temperature-resistant materials, including a \u003cstrong\u003eglazed L-5 steatite\u003c\/strong\u003e insulator and copper-plated plate, designed to withstand temperatures up to \u003cstrong\u003e2200\u003c\/strong\u003e°F inside the combustion chamber. This precision build ensures an exact fit and the correct micro-amp signal output required by Lennox safety circuits, preventing nuisance service calls that often occur with universal replacement parts.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlame Detection:\u003c\/strong\u003e Accurately detects the presence of a burner flame in the combustion chamber.\u003c\/li\u003e\n\u003cli\u003eSafety: Prevents unsafe conditions, such as gas leakage, by ensuring the furnace only operates when a flame is present.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Response: \u003c\/strong\u003eQuickly detects flame loss, enabling the control system to take immediate corrective action.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part:\u003c\/strong\u003e A genuine Lennox part engineered for compatibility and reliability within Lennox systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngled Design: \u003c\/strong\u003eFeatures an angled component for easier installation and maintenance in some systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand: \u003c\/strong\u003eLennox (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number: \u003c\/strong\u003e44L48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\/Part Number: \u003c\/strong\u003e44L4801\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAN \/ UPC:\u003c\/strong\u003e 66255120351\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType: \u003c\/strong\u003eFlame Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Width:\u003c\/strong\u003e 3.005 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter: \u003c\/strong\u003e0.114 IN (Probe Diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Shipping Weight:\u003c\/strong\u003e  1.5 LB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional Information(Dia x L):\u003c\/strong\u003e 0.114 x 2.205\" Sensor Length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: Routine Maintenance is Key\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe 44L48 flame sensor is a very common failure point due to carbon buildup over time. Technicians should make it standard practice to clean this component annually using fine steel wool or an emery cloth. A simple cleaning can often resolve intermittent heating issues (when the furnace lights and shuts off repeatedly), potentially preventing an unnecessary part replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eThe 44L48 is a direct OEM replacement for the following part numbers:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Numbers:\u003c\/strong\u003e 44L48, 44L4801, T6-2108, PSE-L48, L48.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eNote: Use 'CTRL+F' to search for your specific model:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox GCS16 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nGCS16-024-50, GCS16-030-75, GCS16-036-90, GCS16-048-75, GCS16-048-120, GCS16-060-75, GCS16-060-120.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox GCS16R Series:\u003c\/strong\u003e\u003c\/h3\u003e\nGCS16R-036-90, GCS16R-048-75, GCS16R-048-100, GCS16R-060-75, GCS16R-060-120.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox GCS20 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nGCS20-024-50, GCS20-030-75, GCS20-036-75, GCS20-036-90, GCS20-042-75, GCS20-042-120, GCS20-048-75, GCS20-048-120, GCS20-060-75, GCS20-060-120.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox GCS20R Series: \u003c\/strong\u003e\u003c\/h3\u003e\nGCS20R-024-50, GCS20R-030-75, GCS20R-036-75, GCS20R-036-90, GCS20R-042-75, GCS20R-042-120, GCS20R-048-75, GCS20R-048-120, GCS20R-060-75, GCS20R-060-120.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52451507667307,"sku":"66255120351","price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/44L48_bd5a0ac3-37df-4587-9da9-09cfa2c7a460.webp?v=1771014548"},{"product_id":"lennox-17j56-flame-sensor-065209300-pse-hc2-t6-2108","title":"Lennox P\/N 17J56 (T6-2108) – Genuine OEM Replacement Flame Sensor","description":"\u003ch1\u003e\u003cstrong\u003eLennox P\/N 17J56 (T6-2108) – Genuine OEM Replacement Flame Sensor\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Lennox \u003cstrong\u003e17J56 \u003c\/strong\u003e(also known as Catalog Number \u003cstrong\u003e17J56 \u003c\/strong\u003eand Manufacturer Part Number \u003cstrong\u003eT6-2108\u003c\/strong\u003e) is a genuine \u003cstrong\u003eOEM flame sensor \u003c\/strong\u003edesigned specifically for use in a wide range of Lennox, Allied, Armstrong, Concord, and Ducane \u003cstrong\u003egas-fired furnaces\u003c\/strong\u003e and unit heaters. This critical safety component detects the presence of a flame within the combustion chamber, providing a continuous signal to the control board. If the control board does not receive this signal, it safely shuts off the gas flow, preventing the buildup of unburned gas and maintaining the safety of the heating system. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eBeing a Genuine \u003cstrong\u003eOEM \u003c\/strong\u003epart from Lennox ensures optimal compatibility and reliability. Unlike universal or generic alternatives, this sensor is built with high-temperature resistant materials (glazed L-5 steatite insulator and copper-plated plate) to the exact specifications required by the furnace's safety circuits. This precision fit and validated functionality are crucial for preventing nuisance shutdowns and ensuring dependable, long-term performance. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccurate Flame Detection:\u003c\/strong\u003e Monitors the burner flame to confirm safe ignition and continuous burner operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Reliability:\u003c\/strong\u003e Official part from Lennox, ensuring perfect fitment and validated functionality for compatible units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built with high-temperature resistant materials designed to withstand temperatures up to 2200°F within the combustion chamber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Integration:\u003c\/strong\u003e Plays a vital role in preventing gas leaks and ensuring safe operation of the heating system. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 17J56\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer: \u003c\/strong\u003eLennox (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type: \u003c\/strong\u003eFlame Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number:\u003c\/strong\u003e 17J56\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\/Part #:\u003c\/strong\u003e T6-2108\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions: \u003c\/strong\u003e7.5 in (Height) x 3.05 in (Width)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 0.114 in (Probe Diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Shipping Weight:\u003c\/strong\u003e 2.5 LB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Glazed L-5 steatite insulator; copper-plated plate; nickel-plated steel male terminal. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: The Annual Cleaning\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe most common cause of a faulty flame sensor (leading to a furnace that runs for a few minutes and then shuts off) is a buildup of carbon and oxidation on the sensor rod. Before replacing the T6-2108, try cleaning the existing rod with a light scrub using fine steel wool or an emery cloth. This often restores the sensor's ability to detect the micro-amp current of the flame, potentially saving a service call or the cost of a new part. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eThe 17J56 is a direct OEM replacement for the following part numbers:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eOEM Numbers:\u003c\/strong\u003e\u003c\/h3\u003e\n17J56, T6-2108, 65209300, 17J5601, 20516002.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eAllied\/Armstrong\/Ducane: \u003c\/strong\u003e\u003c\/h3\u003e\n66953. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eNote: Use 'CTRL+F' to search for your specific model and revision number: \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox LD24 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nLD24-75(A, S), LD24-100(A, S), LD24-125(A, S), LD24-150(A, S), LD24-200(A, S), LD24-250(A, S), LD24-300(A, S) (Various Revisions 01-04).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLennox LF24 Series:\u003c\/strong\u003e\u003c\/h3\u003e\nLF24-30A, LF24-45A, LF24-50(A, S), LF24-60A, LF24-75(A, S), LF24-100(A, S), LF24-115(A, S), LF24-125(A, S), LF24-145(A, S), LF24-150(A, S), LF24-175(A, S), LF24-200(A, S), LF24-230(A, S), LF24-250(A, S), LF24-300(A, S), LF24-345(A, S), LF24-400(A, S) (Various Revisions).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eOther Compatible Models:\u003c\/strong\u003e\u003c\/h3\u003e\nSpecific models in the CGHA30, CGHA45, and CGHA60 series\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52878279016811,"sku":"66255112542","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/17J56.jpg?v=1770053646"}],"url":"https:\/\/tophvacparts.com\/collections\/lennox-furnace-flame-sensors-genuine-oem-replacement-flame-rods.oembed","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}