{"product_id":"oem-lennox-ignition-control-board-34m66","title":"OEM Lennox Ignition Control Board — 34M66","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e34M66\u003c\/strong\u003e ignition control board is the electronic brain that manages your furnace's startup and safety sequence. It coordinates the inducer motor, igniter, gas valve, and flame sensing while continuously monitoring safety inputs like the pressure switch and limit controls, ensuring each ignition cycle runs in the correct order and shuts down safely if a fault is detected.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing 34M66 can cause no ignition, intermittent or delayed starts, blower or inducer that won't run, error codes flashing on the diagnostic LED, or a furnace that locks out unpredictably. Heat damage, cracked solder joints, failed relays, and power surges are typical causes of board failure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The ignition control board must match your furnace's exact wiring, timing, and safety logic. A non-OEM board can misread sensors, mistime the gas valve, or fail to enforce critical safety interlocks. The 34M66 is the factory-engineered control your Lennox system was designed around, restoring correct ignition sequencing, accurate diagnostics, and full safety protection.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108439411,"sku":"LNX-34M66","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-LNX-34M66.jpg?v=1783762089","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-ignition-control-board-34m66","provider":"National HVAC Parts","version":"1.0","type":"link"}