{"product_id":"oem-lennox-control-transformer-38631","title":"OEM Lennox Control Transformer — 38631","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e38631\u003c\/strong\u003e transformer steps down line voltage to the low-voltage control power your Lennox system's thermostat, relays, contactor coil, and control board depend on. Without steady 24V control power, none of the system's switching components can energize, so this transformer is central to reliable heating and cooling operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failed transformer leaves the system completely dead on the low-voltage side — a blank thermostat, no response to calls for heat or cool, and no clicking from the contactor. Transformers often burn out from a shorted control wire, a stuck contactor coil, or an overloaded secondary, sometimes with a visible scorch or burnt smell.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e38631\u003c\/strong\u003e is matched to your equipment's primary voltage and secondary VA load, so it supplies clean, correctly rated control power without overheating. An undersized or wrong-voltage substitute can nuisance-trip, fail early, or under-power the contactor and board. The OEM part ensures proper fit and warranty compliance. In stock and ships same day when ordered before 3PM CST.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081116828019,"sku":"LNX-38631","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-LNX-38631.jpg?v=1783759995","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-control-transformer-38631","provider":"National HVAC Parts","version":"1.0","type":"link"}