{"product_id":"903429a-nordyne-control-board-m-series-units","title":"903429A Nordyne Control Board (M Series Units)","description":"\u003ch1\u003e903429A Nordyne Control Board (M Series Units)\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eNormal Stocking Item \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eReplaces\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e: 903429\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e903429A is a factory-authorized Nordyne replacement control board for M series gas furnaces, providing complete sequencing of inducer, ignition, gas valve, and blower operations in a single plug-and-play module.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"relative pb-6 w-full after:border-b after:border-stroke-300 after:w-full after:absolute after:mt-3\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eControl voltage: 24 VAC\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBoard type: Microprocessor-based M series logic\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eStatus indicators: Multi-color LED for diagnostics and fault codes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTerminal layout: Clearly labeled screw and push-on connectors for limit switches, thermostat, inducer, gas valve, blower, and flame sensor\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDiagnostic modes: User-accessible test routines via thermostat jumpers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMounting: Direct-fit to OEM bracket with pre-drilled mounting holes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAmbient rating: –40 °F to 140 °F operating temperature\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDimensions: 6.5 × 4.5 × 1.2 in (approximate)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWeight: 0.85 lb\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOEM Part Number\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e903429A\u003c\/td\u003e\n\u003ctd\u003eCurrent revision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e903429\u003c\/td\u003e\n\u003ctd\u003eOriginal M series control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e822646\u003c\/td\u003e\n\u003ctd\u003eLegacy control board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e103258\u003c\/td\u003e\n\u003ctd\u003eAftermarket equivalent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThis control board fits Nordyne M series single- and multi-stage gas furnaces, including but not limited to:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eM1GB\/M1GC\/M1GD\/M1GH series\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eM2MA\/M2MB\/M2MC\/M2MD series\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFactory-labeled private-brand M series units\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eAlways verify your furnace model and data-plate part number before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eTechnician Notes\u003c\/h2\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDisconnect all power sources and shut off the gas supply before servicing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePhotograph or label every wiring harness and thermostat connection to ensure accurate reconnection.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRemove the old control board from its mounting bracket; inspect harnesses and connectors for damage.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInstall the new 903429A board onto the bracket, aligning all mounting holes and securing hardware.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReconnect wiring per your reference photos, ensuring tight, corrosion-free terminals.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRestore 24 VAC power, then initiate a heat call; observe LED indicators for normal operation (solid green) or diagnostic flash codes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIf a fault appears, consult the M series service manual for code definitions and troubleshooting steps.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eAdditional Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDownloadable M series wiring diagram \u0026amp; installation guide (PDF)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrintable control board cross-reference cheat sheet\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e903429 Nordyne integrated control board M Series units\u003c\/h2\u003e\n\u003ch2\u003e1 year Warranty on everything we sell! \u003c\/h2\u003e\n\u003cp\u003eNordyne integrated UTECH circuit board for M1M furnaces. For a spare or replacement fuse, order 3A fuse G32-189. \u003cbr\u003e\u003cbr\u003eReplaces 624602, 6246020, 624602-0, 624602A, 624602B \u0026amp; 624640, \u003cspan\u003e624640-A\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: #ff0000;\" color=\"#FF0000\"\u003eCONTROL LIGHT STATUS\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eRED\u003c\/span\u003e\u003cbr\u003eSteady ON Control OK\u003cbr\u003eSteady OFF No power\u003cbr\u003eRapid Flash False flame or internal control fault\u003cbr\u003e1 Flash Limit switch is open\u003cbr\u003e2 Flashes Pressure switch is open with inducer on\u003cbr\u003e3 Flashes Pressure switch is closed with inducer off\u003cbr\u003e4 Flashes Lockout due to failed ignition\u003cbr\u003e5 Flashes 115 vac \u0026amp; neutral reversed or no ground\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eYELLOW\u003c\/span\u003e\u003cbr\u003eSteady ON Good Flame Signal\u003cbr\u003eBlinking Weak Flame Signal\u003cbr\u003eSteady OFF No Flame Signal\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eM1M-Control Board Replacement\u003c\/b\u003e\u003cbr\u003eReplace the control board only after determining a failure has occurred in it. Most problems that are blamed on control are actually external to control. If control has failed, use the following procedure to replace.\u003cbr\u003e1. Disconnect power to unit by turning off power switch.\u003cbr\u003e2. Disconnect molex plugs and all push on terminal connections. Note connections for rehook up.\u003cbr\u003e3. After all wire connections have been removed you mustsqueeze the four white stand offs to remove board.\u003cbr\u003e4. Carefully line up holes on the new board over standoffs, and push into place. Caution: push from outside edge only - be careful of fragile components.\u003cbr\u003e5. Reinstall all molex plugs and wires removed in step 2.\u003cbr\u003e6. Apply power and re-test.\u003c\/p\u003e","brand":"Quinn","offers":[{"title":"Default Title","offer_id":42414587740226,"sku":"903429A","price":205.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/OIP_2_7a0f6015-6ba6-47f0-9965-6b6847479cee.webp?v=1756185459","url":"https:\/\/hvacpartstore.com\/products\/903429a-nordyne-control-board-m-series-units","provider":"HVACpartstore","version":"1.0","type":"link"}