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Hello, I’m having a problem with my (ancient) Lennox G11Q3E-110V-6 gas furnace. What’s happening is: Comes on (spark, pilot, main burners come on almost simultaneously) Stays on for 1 to 45 seconds (measured: 19,2,12,24,12,14,1,7,45,19 seconds) Goes off for between 6 to 52 seconds...