My Pulse 21 has worked flawlessly for 7 years. Over the last month it develoed a problem where it would not kick on. Turning the power to furnance off and then back on would fire it up. Sometimes would run for a day, sometimes for a week. Finally decided replace the ignition module(the blue box w/ the flashing geeen LED light). This solved the problem. I got the module at my local Lennox dealer for $115. Easy 10 minute install with just a screw driver. Wires are all quick connect. Happy heating
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