I have a Lennox Comfortsense 7000 thermostat, and it went blank. I can't turn my AC on. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? I think thermastat. Contractor's Assistant: Do you plan on doing the work yourself? If it's easy. 2008 Lennox Industries Inc. Dallas, Texas, USA Read this manual before programming this thermo-stat. Use this thermostat only as described in this manual. Shipping and Packing List (SERVICEMAN'S MANUAL) ComfortSense 7000 Series Model L7742U Touch Screen Programmable Thermostat CONTROLS Find great deals on eBay for lennox y2081. Shop with confidence. INSTALLATION INSTRUCTIONS SLP98DFV DAVE LENNOX SIGNATURE® COLLECTION GAS FURNACE DOWNFLOW AIR DISCHARGE 506611?01 02/2011 Supersedes 10/2010 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE the Lennox ComfortSense® 7000 thermostat may be used, as Installation and Setup Guide Color Touchscreen Programmable Commercial Thermostat ComfortSense manual. 3 ComfortSense 2008 Lennox Industries Inc. Dallas, Texas, USA COOLING TUE OCT 23 1:15PM HOMEOWNER'S MANUAL ComfortSense 7000 Series Model L7742U Touch Screen Programmable Thermostat CONTROLS 506062?01 or in a manual mode using the SCHED box. These manuals can include commercial & residential products. Browse the various installation & service manuals we have for technical information regarding heating and air conditioning (AC) equipment such as: humidifiers, air cleaners, and thermostats made by various brands (i.e. Honeywell and Lennox). Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get them in front of Issuu's How does the Lennox ComfortSense 7000 Series (L7742U) thermostat know which of the three programs Full Week, Work Week, or Day by Day is requested? I have read the manual, but I can't find that information.