{"product_id":"viessmann-7819838","title":"Viessmann 7819838 Transformer","description":"\u003cp\u003eThe \u003cstrong\u003eViessmann 7819838 Transformer\u003c\/strong\u003e is a critical replacement component engineered for precision voltage regulation within commercial and residential hydronic heating systems. Designed as an \u003cstrong\u003eOEM Viessmann part\u003c\/strong\u003e, this step-down transformer features a \u003cstrong\u003e230V primary\u003c\/strong\u003e input and a dual-tap \u003cstrong\u003e15\/24V secondary\u003c\/strong\u003e output, ensuring stable power delivery to sensitive burner controls, ignition modules, and logic boards. Professional contractors often source this unit to resolve intermittent communication errors or control sequence failures in \u003cstrong\u003eVitodens WB2A\u003c\/strong\u003e series boilers and similar high-efficiency condensing units. Its robust electromagnetic induction design provides consistent \u003cstrong\u003elow voltage\u003c\/strong\u003e output, protecting integrated circuits from primary line fluctuations and preventing nuisance lockouts. When performing a field replacement, verify terminal assignments for the 15V and 24V circuits to maintain proper phasing and system interoperability. This \u003cstrong\u003eHVAC voltage transformer\u003c\/strong\u003e is the direct solution for restoring the electrical integrity of the boiler's power\/pump modules.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Output Versatility:\u003c\/strong\u003e Direct compatibility with systems requiring both 15V and 24V secondary circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Precision:\u003c\/strong\u003e Genuine \u003cstrong\u003eViessmann 7819838\u003c\/strong\u003e ensures exact fitment and electrical calibration for Vitodens series boilers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Protection:\u003c\/strong\u003e Delivers stable \u003cstrong\u003eAC voltage conversion\u003c\/strong\u003e, reducing the risk of premature failure in expensive control boards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Built to withstand the thermal demands of high-cycle industrial and residential heating environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions:\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of a failing Viessmann transformer?\u003c\/strong\u003e Typically, a failing unit presents as a total loss of power to the display, intermittent ignition failures, or recurring low-voltage fault codes on the control interface.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace an older autotransformer unit?\u003c\/strong\u003e Yes, the 7819838 is the current standard for modules requiring 230V primary input, though technicians should check for reversed line\/neutral polarity which can trip GFCIs on older installations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre both secondary voltages used simultaneously?\u003c\/strong\u003e Depending on the specific boiler model and control board architecture, the system may utilize both the 15V logic power and 24V accessory taps.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Viessmann","offers":[{"title":"Default Title","offer_id":43504627089586,"sku":"7819838","price":255.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_c1345ff6-b815-4f4c-8bf9-49d506a4ad35.png?v=1752266936","url":"https:\/\/www.gsistore.com\/en-ca\/products\/viessmann-7819838","provider":"GSIstore","version":"1.0","type":"link"}