{"product_id":"honeywell-st74d1001-defrost-control-circuit-board-201479","title":"Honeywell ST74D1001 Defrost Control Circuit Board 201478","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\u003cp\u003e\u003cstrong\u003e• Designed for heat pump defrost control applications\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e• Model number: ST74D1001 (Honeywell) \/ 201478  • Controls the timing and duration of defrost cycles to optimize system performance  • Compatible with Honeywell and Lennox HVAC heat pump units  • Electronic control features improve energy efficiency and reduce unnecessary defrosting  • Replaces OEM control board part numbers: Honeywell ST74D1001, Lennox 1084-851, and similar variants  • Operates with standard 24V control voltage typical in residential HVAC systems  • Enhances reliability by ensuring proper defrost timing and system protection  • Compact circuit board design for easy installation in heat pump units  • Tested to meet manufacturer specifications for performance and durability\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":43672925765741,"sku":"12786","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2419\/1853\/files\/s-l800_09a618e9-f09d-4260-9391-d4b8053e0c16.jpg?v=1763343254","url":"https:\/\/willardshvacsupply.com\/products\/honeywell-st74d1001-defrost-control-circuit-board-201479","provider":"Willard's HVAC Supply","version":"1.0","type":"link"}