{"product_id":"lennox-50a66-123-04-furnace-control-board-quick-delivery","title":"50A66-123-04 | Lennox Furnace Control Board for Single-Stage HVAC Systems","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"21\" data-end=\"474\"\u003eThe Lennox 50A66-123-04 is an OEM furnace control circuit board designed to manage critical functions in single-stage residential heating systems. This Lennox-branded part orchestrates ignition, safety monitoring, and fan control to ensure consistent and safe furnace operation. Its primary application is as a direct replacement control board for compatible Lennox and White-Rodgers furnaces.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLennox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50A66-123-04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHVAC Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHVAC Control System Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIgnition Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSilicon Nitride Ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeating Stages\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle-Stage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrimary Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFurnace ignition and safety control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThermostat, sensors, blower motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCross-Reference Numbers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150-0993, 100925-03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInternal furnace cabinet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Environment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndoor residential furnace\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard HVAC quick-connect\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~0.75 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About \u003cmeta charset=\"utf-8\"\u003e\n\u003cspan data-sheets-root=\"1\"\u003e50A66-123-04\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-start=\"503\" data-end=\"1065\"\u003eThe 50A66-123-04 is a furnace control system board used within Lennox residential heating equipment and compatible OEM platforms. It operates on a 24 VAC control circuit and supports silicon nitride ignition technology for controlled burner startup. The board interfaces with thermostats, flame sensors, limit switches, and blower motors to coordinate heating cycles. Its standardized terminal layout and rugged PCB construction allow reliable installation within furnace cabinets operating under continuous thermal conditions.\u003c\/p\u003e\n\u003ch3 data-start=\"1067\" data-end=\"1088\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong data-start=\"1085\" data-end=\"1102\"\u003eKey Features:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOEM Lennox Control Board: Manufactured to Lennox specifications for precise system compatibility.\u003c\/li\u003e\n\u003cli\u003eIgnition Sequence Management: Controls silicon nitride ignitor timing and burner activation.\u003c\/li\u003e\n\u003cli\u003e24 VAC Control Logic: Supports standard low-voltage residential HVAC control systems.\u003c\/li\u003e\n\u003cli\u003eSafety Circuit Integration: Monitors limit switches, flame sensing, and fault conditions.\u003c\/li\u003e\n\u003cli\u003eSingle-Stage Furnace Support: Designed for furnaces with single-stage heating operation.\u003c\/li\u003e\n\u003cli\u003eCross-Reference Compatibility: Matches common OEM equivalents used across Lennox platforms.\u003c\/li\u003e\n\u003cli\u003eDurable PCB Construction: Built to withstand heat and electrical load within furnace enclosures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 50A66-123-04 delivers the reliability and precision required for accurate furnace ignition control and safe residential heating operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":51058465866026,"sku":"50A66-123-04","price":232.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/s-l1600_e4cb0604-0c02-4bff-8489-398038d7cf2e.webp?v=1768587086","url":"https:\/\/iqelectro.com\/products\/lennox-50a66-123-04-furnace-control-board-quick-delivery","provider":"IQElectro","version":"1.0","type":"link"}