{"product_id":"source-1-1659423-furnace-control-circuit-board-659423-d678a","title":"Source 1 1659423 Furnace Control Circuit Board 659423  #D678A","description":"\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis product may contain shelf wear, have minor cosmetic imperfections, or have been tested. All our certified pre-owned products are backed by our return policy. We offer free shipping on all items. Please contact us for discounts or if you have any questions. We look forward to doing business with you!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSource 1 1659423 Furnace Control Circuit Board\u003c\/strong\u003e (also referenced as 659423) is a replacement control board designed for use in residential and light commercial gas furnace systems. This board serves as the primary control module, managing ignition sequencing, blower motor operation, and safety functions to ensure reliable furnace performance.\u003c\/p\u003e\n\n\u003cp\u003eThis circuit board is engineered as a direct replacement for compatible Source 1 and affiliated OEM furnace models. It integrates standard diagnostic LED indicators for simplified troubleshooting and features onboard terminals for thermostat connections, gas valve control, blower relay outputs, and flame sensing circuitry. The board is built to meet OEM specifications, ensuring proper fit and function when replacing a failed or malfunctioning original control module.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for straightforward installation, this control board is suitable for HVAC technicians performing furnace repairs and maintenance. It is recommended to verify compatibility with your specific furnace model and existing wiring configuration before purchase.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Source 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 1659423 \/ 659423\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Reference:\u003c\/strong\u003e #D678A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Furnace Control Circuit Board\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Residential and light commercial gas furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e Typically rated at 24V control \/ 120V line voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e Onboard diagnostic LEDs, integrated safety controls, thermostat and blower relay terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Certified Pre-Owned\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIf you have questions about compatibility with your specific furnace make and model, please contact us before ordering. Our team can assist in verifying proper fitment and functionality for your application.\u003c\/p\u003e","brand":"Source 1","offers":[{"title":"Default Title","offer_id":43673189482605,"sku":"14774","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2419\/1853\/files\/s-l800_c498a9f1-7a03-406d-923f-dbe806ca7de0.jpg?v=1763350126","url":"https:\/\/willardshvacsupply.com\/products\/source-1-1659423-furnace-control-circuit-board-659423-d678a","provider":"Willard's HVAC Supply","version":"1.0","type":"link"}