I am using this thread as my problem looks the same as stated above. EL195UH110P60C EL195UH135P60D 1 AFUE 95% Input - Btuh 110,000 132,000 Output - Btuh 106,000 126,000 Temperature rise range - °F 40 - 70 45 - 75 Shows that Code is pressure switch open with - Answered by a verified HVAC Technician An unknown device is seen on the subnet in or outside of configuration mode. LED Status is 3 flashes. heating and air-conditioning systems, as well as indoor air quality equipment, must be installed and maintained adhering to the manufacturer’s instructions and safety guidelines and in compliance with all applicable federal, state, and local laws, regulations, codes, policies, and licensing requirements. Without heat and noticing flickering lights on your Lennox furnace? Alert Code Priority Alert Text Steps to clear; 10: Critical (Stat) The thermostat has found an unknown device on the system. I have a Lennox ML180UH furnace. All our Technicians are Certified and have HVAC education as well as being certified in design, fabrication, layout, and installation of forced air heating/cooling systems. I have Lennox ML195UH series not igniting. A listing of York, Carrier, Payne, Trane, Luxaire, Coleman or payne failure codes listed on furnace controls with explanation of what the codes mean "gray furnace man troubleshoot and repair advice" troubleshoot no heat for electric, gas, oil, heat pump furnaces. Page 3 SPECIFICATIONS Gas Heating Performance Model No. ROMA HEATING AND COOLING has been in the HVAC business for more than 20 years. Try our quick support handbook to determine what could be wrong. Codes are alternating slow flashing. I need some help figuring out these Lennox furnace diagonostic codes.What is it you need help understanding? Then call Central Heating & Plumbing for expert help in New Castle now! Page 1: Table Of Contents INSTALLATION INSTRUCTIONS E 2011 Lennox Industries Inc. Dallas, Texas, USA ML195UH ® MERIT SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 506723−01 Litho U.S.A. 07/2011 Supersedes 506533−01 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol … LENNOX MINI-SPLIT SYSTEMS SERVICE MANUAL Lennox Mini-Split Service Manual PDF is here if further troubleshooting is needed.. LENNOX SERVICE MANUAL FOR ROOM AIR CONDITIONER (Inverter Split-Type) PDF is here. Manual is applicable only to the following models – LNIV2610, LNIV3510, LNIV5010, LNIV6510. The Lennox ML195 Gas Furnace is built for reliability and efficiency, with a 95% AFUE rating, the ideal combination of energy efficiency and affordability. indoor unit display codes (all systems)-ms7 series units — mini-split single-zone systems lennox ac troubleshooting According to the diagnostic code table the alternating slow flashing means: Watchguard - burners failed to ignite or lost flame sense 4 times in one heating cycle. Won’t ignite.