Hi, I have a Lennox G61MPV gas furnace unit that has been working fine for about 5 years. G61MPV series units are high−efficiency multi−position (upflow, downflow, horizontal right and left) gas furnaces manufactured with Lennox Duralok Plus heat exchang-ers formed of an aluminized steel primary with a stainless steel secondary condensing coil. I turned on the thermostat, and the furnace main blower never came on. Flip the circuit breaker switch labeled “Furnace” or “Heating System” into the “Off” position. With service calls from furnace repairmen costing more than $100 in most cases, doing what you can to fix the problem, or at … Lennox furnace not heating-code=pressure switch I have a lennox elite series gas furnace. Step 1 Start with the basics. Find your electrical panel and switch off the electrical supply to your furnace. Here are a few other of the most routine faults for Lennox heating systems. The majority of these issues must be taken care of by a professional, like one from Bishop Heating & Air Conditioning. I ran the heating system several weekends last spring and the furnace seemed to function ok. Here are some of the light patterns you might notice when your heat will not or keep running. This Lennox gas furnace troubleshooting guide will help you know what to do when your furnace won't start or won't perform as it should. If the thermostat is reset (turned to off then back to on) the unit starts right up and operates fine for a day or two. Look at the control panel on your furnace. Lennox® Furnace Service Manuals The Adobe Acrobat Reader® Application is Needed to Read ".pdf" Files Click Here to Get a Free Copy of Acrobat Reader®. Looked at the Surefire panel and the led lights indicate a pressure switch problem....panel says open or closed switch or blocked vent. URGENT - Lennox G61MPV furnace schematic. Both LED lights are extinguished. Step Two. I have a Lennox G61MPV-60C-090-02 and it is not blowing heat. Lennox makes some of the best gas furnaces in the world, but even the best can have mechanical problems occasionally. Recently, in the middle of the night the unit won't engage when the temperature drops below the set point. I figured it was the thermostat so I bought and installed a … This summer we used the air conditioning and again everything seemed fine. This will eliminate the risk of any electrical injuries. When I had a service tech come look at i … read more If your Lennox gas furnace won't start, doesn't provide enough heat or continuously cycles on and off, a bit of troubleshooting might just solve the problem without ever having to get a repairman involved. Last week we noticed an electrical burning smell in the house and now the furnace won't blow air. How To Reset a Lennox Furnace Step One. The source of fuel is a 500 gallon propane tank. 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