{"product_id":"50a55-843-furnace-control-board-compatible-white-rodgers-lennox","title":"50A55-843 Furnace Control Board Compatible with White-Rodgers Lennox","description":"\u003ch2\u003e50A55-843 Furnace Control Board Compatible with White-Rodgers Lennox\u003c\/h2\u003e\n\u003cp\u003eThe 50A55-843 integrated furnace control is engineered as a universal replacement board for gas furnaces running a White-Rodgers 50A50 or 50A55 series control. A built-in microprocessor manages burner ignition, flame sensing and blower operation, and the board ships with the wiring harness, ROS-ROI jumper wire, mounting screws and cable ties needed to complete a standard swap in one order.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/3836\/3894\/files\/1_d75aa669-cbb5-49e4-9935-fad029d70c48.jpg?v=1788585208\" alt=\"50A55-843 furnace control board with wiring harness kit A+ banner\" style=\"max-width:100%;height:auto;margin:12px 0;border-radius:6px;display:block;\"\u003e\n\n\u003ch3\u003e📋 Key Takeaways\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eExact Replacement:\u003c\/strong\u003e Replaces the White-Rodgers 50A55-843 control board for direct, hassle-free installation.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eBroad Series Coverage:\u003c\/strong\u003e Compatible with White-Rodgers and Lennox furnace systems, covering 50A50 series (50A50-241, 50A50-405) and 50A55 series (50A55-486) controls.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eAutomatic Safety Control:\u003c\/strong\u003e Microprocessor ignition with flame confirmation, safe gas-valve shutoff on fault, and one-hour auto reset.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eComplete Installation Kit:\u003c\/strong\u003e Includes wiring harness, ROS-ROI jumper, screws and cable ties — no extra parts to buy.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eBuilt-in Diagnostics:\u003c\/strong\u003e On-board LED fault codes plus a field-serviceable 3 A automotive fuse that protects the low-voltage transformer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/3836\/3894\/files\/2_4386e9d7-00b3-45ad-b0f4-9b950c44227f.jpg?v=1788585209\" alt=\"50A55-843 furnace control board compatibility LED diagnostics A+ banner\" style=\"max-width:100%;height:auto;margin:12px 0;border-radius:6px;display:block;\"\u003e\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;clear:both;width:100%;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;table-layout:fixed;word-wrap:break-word;\"\u003e\n  \u003ctr\u003e\n\u003cth style=\"width: 35%;\"\u003eFeature\u003c\/th\u003e\n\u003cth\u003eBenefit (What It Means for You)\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eMicroprocessor Ignition \u0026amp; Monitoring\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eAutomatic ignition with flame confirmation; continuous supervision of burner, inducer and blower. On fault the gas valve shuts down safely, and the control resets itself one hour after lockout — fewer service trips.\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eWhite-Rodgers \u0026amp; Lennox Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eReplaces the White-Rodgers 50A55-843 and covers 50A50-241, 50A50-405 and 50A55-486 series controls used in White-Rodgers and Lennox gas furnaces.\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003e25 VAC Standard Control Ratings\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eInput 25 VAC 50\/60 Hz at 0.45 A with gas valve relay 1.5 A and ignitor relay 6 A at 120 VAC — matched to the original system for safe operation.\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eFlame-Retardant Circuit Board\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eBuilt on a flame-retardant PCB for dependable, long-term operation inside the furnace control compartment.\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eLED Diagnostics + 3 A Fuse\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eLED flash codes point to lockout, pressure switch, limit switch and flame faults; the automotive-type fuse is the only field-serviceable part and protects the low-voltage transformer from shorts.\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eMarked Terminals + Full Kit\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eTerminal markings match the original layout and wiring is included, so you can photograph the old board and move every wire to the identically marked terminal.\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3 id=\"compatibility\"\u003eCompatibility \u0026amp; Cross-Reference\u003c\/h3\u003e\n\u003ch4\u003eReplaces \/ Interchange Part Numbers:\u003c\/h4\u003e\n\u003cdiv style=\"overflow-x:auto;clear:both;width:100%;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;table-layout:fixed;word-wrap:break-word;\"\u003e\n  \u003ctr\u003e\n\u003cth style=\"width: 50%;\"\u003eInterchange Part Number\u003c\/th\u003e\n\u003cth\u003eSystem \/ Brand\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e50A55-843\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite-Rodgers (this replacement)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e50A50-241\u003c\/td\u003e\n\u003ctd\u003eWhite-Rodgers 50A50 series\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e50A50-405\u003c\/td\u003e\n\u003ctd\u003eWhite-Rodgers 50A50 series\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e50A55-486\u003c\/td\u003e\n\u003ctd\u003eWhite-Rodgers 50A55 \/ Lennox systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch4\u003eCommon Applications:\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eWhite-Rodgers gas furnaces using a 50A55-843 control board\u003c\/li\u003e\n  \u003cli\u003eWhite-Rodgers 50A50 \/ 50A55 series gas furnaces\u003c\/li\u003e\n  \u003cli\u003eLennox gas furnace systems using 50A50 \/ 50A55 series controls\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis control is designed for furnaces that use a \u003cstrong\u003esilicon carbide (SiC) ignition system\u003c\/strong\u003e. Confirm the model number printed on your old board against the list above before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;clear:both;width:100%;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;table-layout:fixed;word-wrap:break-word;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"width: 40%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50A55-843\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 VAC, 50\/60 Hz, 0.45 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas Valve Relay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5 A at 25 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIgnitor Relay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 A at 120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInducer \/ Circulator Relays\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRated for furnace blower loads (2.2 FLA \/ 14.5 FLA)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 to 175 °F (-40 to 80 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHumidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5% - 93% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFuse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 A automotive type (field-serviceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlame-retardant PCB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eControl board, wiring harness, ROS-ROI jumper wire, mounting screws and cable ties\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhy Choose iFJF?\u003c\/h3\u003e\n\u003cp\u003eiFJF supplies furnace control boards factory-direct, so you get the replacement part without the dealership markup. What you can verify before you buy:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCross-reference you can check yourself:\u003c\/strong\u003e the replacement range (50A50-241, 50A50-405, 50A55-486) is listed openly above — match your old board number first.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eComplete kit, no hidden extras:\u003c\/strong\u003e wiring harness, ROS-ROI jumper, screws and cable ties are all in the box, so a standard replacement needs nothing else.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWiring guidance built for DIY:\u003c\/strong\u003e photograph and label the old wiring before removal, then move every wire to the identically marked terminal — with the ROS-ROI jumper connected, the indicator works as expected.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDiagnostics that tell you what failed:\u003c\/strong\u003e LED fault codes and the replaceable 3 A fuse let you confirm the board state before calling for service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background:#fff3e0;border:1px solid #ffb74d;border-radius:4px;padding:12px;margin-bottom:16px;\"\u003e\n  \u003cstrong\u003eInstallation note:\u003c\/strong\u003e replacement should be performed by a qualified HVAC contractor or licensed electrician. Always turn off power and shut off the gas supply before removing the old control. If you are unsure whether this control matches your furnace, message us with the model number printed on your old board before ordering.\n\u003c\/div\u003e\n\u003cp\u003eNeed help finding the right part? Our support team answers fitment questions before you order — \u003cstrong\u003esupport@ifjf.com\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eLooking for related upgrades? \u003ca href=\"\/products\/1170063-furnace-control-board-replaces-1138-200-icp-furnaces\"\u003eCheck out our iFJF 1170063 furnace control board for ICP furnaces here →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top:12px;\"\u003e📂 \u003cstrong\u003eBrowse More:\u003c\/strong\u003e \u003ca href=\"\/collections\/electronics\"\u003eAll Electronics Products →\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Will this replace my White-Rodgers 50A55-843 board?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This control is a direct replacement for the White-Rodgers 50A55-843 and operates on the same 25 VAC furnace control application, with terminals laid out to match the original board. Check the model number printed on your old board against our \u003ca href=\"#compatibility\"\u003eCross-Reference table\u003c\/a\u003e before ordering.\u003c\/p\u003e\n\u003ch4\u003eQ: Will it work in my Lennox gas furnace?\u003c\/h4\u003e\n\u003cp\u003eA: It is compatible with Lennox furnace systems and covers 50A50 series controls such as 50A50-241 and 50A50-405, plus 50A55 series controls such as 50A55-486. Confirm your furnace uses a silicon carbide (SiC) ignition system and verify your old board model before ordering.\u003c\/p\u003e\n\u003ch4\u003eQ: What is included in the package?\u003c\/h4\u003e\n\u003cp\u003eA: One control board, a wiring harness, a ROS-ROI jumper wire, mounting screws and cable ties. A standard replacement needs no extra parts.\u003c\/p\u003e\n\u003ch4\u003eQ: Why does the indicator light not come on after installation?\u003c\/h4\u003e\n\u003cp\u003eA: The indicator works only when the ROS and ROI terminals are connected with the included jumper wire. Connect those two terminals, then power up — the LED should flash once as a power-on self check.\u003c\/p\u003e\n\u003ch4\u003eQ: What if my board model is outside the listed range?\u003c\/h4\u003e\n\u003cp\u003eA: The White-Rodgers cross-reference chart states that the 50A55-843 universal control replaces the full 50A50 and 50A55 model families. If your board is outside the numbers listed here, message us with the exact model printed on the board before ordering so we can confirm the match.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I protect the board during troubleshooting?\u003c\/h4\u003e\n\u003cp\u003eA: The 3 A automotive-type fuse is the only serviceable part and protects the low-voltage transformer from short-circuit damage. If the fuse keeps opening, find and fix the short first, then replace the fuse. Follow the maintenance schedule of your furnace manufacturer.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 50A55-843 furnace control board\u003c\/li\u003e\n  \u003cli\u003e1 × wiring harness\u003c\/li\u003e\n  \u003cli\u003e1 × ROS-ROI jumper wire\u003c\/li\u003e\n  \u003cli\u003e1 × set of mounting screws and cable ties\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Problems with Furnace Control Boards — Solved by iFJF\u003c\/h3\u003e\n\u003cp style=\"font-size:0.95em;color:#666;\"\u003eWe analyzed verified customer reviews of OEM and aftermarket control boards in this category. Here is what owners keep complaining about — and how this board addresses it:\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;clear:both;width:100%;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;table-layout:fixed;word-wrap:break-word;\"\u003e\n  \u003ctr style=\"background:#fafafa;\"\u003e\n\u003cth style=\"width:35%;\"\u003e❌ What Owners Complain About\u003c\/th\u003e\n\u003cth style=\"width:5%;\"\u003e\u003c\/th\u003e\n\u003cth style=\"width:60%;\"\u003e✅ How This Board Addresses It\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003e\"It says compatible but my furnace did not work\"\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.85em;color:#888;\"\u003e— #1 cause of returns in this category\u003c\/span\u003e\n\u003c\/td\u003e\n    \u003ctd style=\"text-align:center;vertical-align:top;padding:10px;\"\u003e→\u003c\/td\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003eCheck the model before you buy\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.9em;\"\u003eThe covered numbers (50A50-241, 50A50-405, 50A55-486) and the SiC ignition requirement are stated openly, so you can verify your old board and furnace type before ordering.\u003c\/span\u003e\n\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003e\"Installed it and the indicator would not come on\"\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.85em;color:#888;\"\u003e— Often a wiring step, not a dead board\u003c\/span\u003e\n\u003c\/td\u003e\n    \u003ctd style=\"text-align:center;vertical-align:top;padding:10px;\"\u003e→\u003c\/td\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003eROS-ROI jumper wiring made explicit\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.9em;\"\u003eThe indicator only works when ROS and ROI are connected with the included jumper. This step is called out in the listing so it is not missed during install.\u003c\/span\u003e\n\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003e\"No guidance, no way to check the install\"\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.85em;color:#888;\"\u003e— Common DIY hesitation\u003c\/span\u003e\n\u003c\/td\u003e\n    \u003ctd style=\"text-align:center;vertical-align:top;padding:10px;\"\u003e→\u003c\/td\u003e\n    \u003ctd style=\"padding:10px;vertical-align:top;\"\u003e\n\u003cstrong\u003ePhoto-first wiring on marked terminals\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:0.9em;\"\u003ePhotograph and label the old wiring before removal, then move each wire to the identically marked terminal. The full kit — harness, jumper, screws and ties — arrives in one box.\u003c\/span\u003e\n\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"margin-top:12px;font-size:0.9em;\"\u003e🔎 \u003cem\u003eWe read the 1-star and 2-star reviews so you don't have to. This board is engineered around the real problems owners face — not just a spec sheet.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f0f7ff;border:1px solid #b8d4f0;border-radius:6px;padding:16px;margin-top:20px\"\u003e\n  \u003cstrong\u003eFactory Direct Supply \u0026amp; Wholesale\u003c\/strong\u003e — iFJF is a direct manufacturer of high-performance replacement parts for heating and filtration systems. Custom specifications and bulk orders are highly welcome. Contact us for exclusive dealer pricing and volume discounts. Backed by \u003cstrong\u003eISO 9001:2015\u003c\/strong\u003e and \u003cstrong\u003eIATF 16949:2016\u003c\/strong\u003e quality management system certifications.\u003cbr\u003e\n  \u003cstrong\u003eEmail:\u003c\/strong\u003e support@ifjf.com\n\u003c\/div\u003e\n","brand":"iFJF","offers":[{"title":"Default Title","offer_id":51587104997622,"sku":"FJ-CB-5843","price":137.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/3836\/3894\/files\/1.jpeg?v=1788584854","url":"https:\/\/ifjf.net\/products\/50a55-843-furnace-control-board-compatible-white-rodgers-lennox","provider":"iFJF Direct","version":"1.0","type":"link"}