{"product_id":"lennox-a55-45l74-hb-01905da-m1-5-rev-c-control-board-79j9270-em1-1-91j89","title":"LENNOX A55 45L74 HB-01905DA M1-5 REV C Control Board 79J9270 EM1-1 91J89","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· Model: LENNOX A55 M1-5 REV C (part number 45L74 HB-01905DA)\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e· Application: Main control board for Lennox HVAC units (such as LGT, LCT 156H) with up to two compressors and three condenser fans · Controls gas ignition, blower motor, compressor staging, and safety circuits including pressure and limit switches · Supports two-stage operation for heating and cooling demands · Microprocessor-based with built-in diagnostic LEDs for fault detection and troubleshooting · Input voltage: Compatible with 208\/230V 1-phase and 3-phase systems · Communication: Interfaces with sensors, relays, and optional accessories via dedicated terminals (e.g., EM1-1, C1-2, G1-2 connections) · Functions include reversing valve control, blower speed regulation, ignition sequencing, and safety lockouts · Designed for use in Lennox configured-to-order units with flexible control system features such as fresh air ventilation and night setback modes · Replacement part number: 79J9270 · Dimensions and mounting compatible with standard Lennox control box layouts for quick installation and replacement · Tested for operational reliability and compliance with Lennox OEM standards\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":43673129156717,"sku":"14211","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2419\/1853\/files\/s-l800_33dd3e7f-6307-412a-8acc-657544bfffa6.jpg?v=1763348194","url":"https:\/\/willardshvacsupply.com\/products\/lennox-a55-45l74-hb-01905da-m1-5-rev-c-control-board-79j9270-em1-1-91j89","provider":"Willard's HVAC Supply","version":"1.0","type":"link"}