{"product_id":"lennox-53k80-fan-timer-control-board","title":"Lennox 53K80 Fan Timer Control Board","description":"\u003cp\u003eThe \u003cstrong\u003eLennox 53K80 Fan Timer Kit\u003c\/strong\u003e (replaces \u003cstrong\u003eLB-90157A\u003c\/strong\u003e) is a critical OEM replacement component engineered for precise fan motor orchestration in Lennox Pulse G21 and high-efficiency furnace series. This \u003cstrong\u003eHVAC control board\u003c\/strong\u003e integrates a sophisticated \u003cstrong\u003efan timer control\u003c\/strong\u003e circuit that manages the post-purge and pre-purge cycles of the blower motor to optimize heat exchanger thermal discharge. Designed for high-duty cycle applications, the kit includes the primary \u003cstrong\u003e53K80 circuit board\u003c\/strong\u003e and required mounting hardware, facilitating a direct drop-in replacement for legacy part numbers including 97H03, 79J65, and 51K46. As a veteran-grade \u003cstrong\u003efurnace replacement part\u003c\/strong\u003e, it ensures the induction and blower timings remain within factory specifications, preventing limit-trip scenarios and maintaining static pressure stability across the plenum. Its voltage-regulated design supports consistent \u003cstrong\u003efan speed control\u003c\/strong\u003e and 24VAC logic signaling, making it the industry standard for restoring original equipment performance in older Lennox heating systems.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Compatibility:\u003c\/strong\u003e Engineered specifically for Lennox Pulse G21 units and compatible furnace models, ensuring seamless integration with existing 24V wiring harnesses.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise Cycle Management:\u003c\/strong\u003e Regulates the timing of the blower fan to extract maximum residual heat after the burner cycles off, improving overall AFUE performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Protection:\u003c\/strong\u003e Helps prevent heat exchanger overheating by maintaining strict control over fan \"on\" and \"off\" delays.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComprehensive Kit:\u003c\/strong\u003e Includes the upgraded \u003cstrong\u003eLB-90157A\u003c\/strong\u003e board and necessary mounting components to address common terminal oxidation or relay failure issues.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhat Lennox models are compatible with the 53K80?\u003c\/strong\u003e This kit is primarily utilized in the Lennox Pulse G21 series and various model numbers such as the LF24-75A-1. Always verify the part number on your existing board.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCan this board replace a 97H03 or 76H31?\u003c\/strong\u003e Yes, the 53K80 is the official manufacturer-designated replacement for legacy part numbers 97H03, 79J65, 76H31, and 51K46.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDoes the kit include mounting standoffs?\u003c\/strong\u003e Yes, the kit includes the essential hardware needed to secure the board to the furnace control cabinet.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\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":"Lennox","offers":[{"title":"Default Title","offer_id":35648105676,"sku":"53K80","price":243.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Image_cb1203d4-412b-4928-b2dc-47d1d95bc75d.png?v=1791585958","url":"https:\/\/www.gsistore.com\/en-ca\/products\/lennox-53k80-fan-timer-control-board","provider":"GSIstore","version":"1.0","type":"link"}