Thanks for posting the help on how to clean the flame sensor. We have a Lennox 80MGF3/4-100A-7 which was not kicking the heat after trying and failing for 5 consecutive times. Had to reset the thermostat to start the cycle. Used hexnut screwdriver to get to the two sensors and clean with sandpaper and a papertowel and wipe of the dust settled. Heater is working great. It was a bit tricky yo get to one of them. You may need to take out one of the burners but it is very easy to put them back. Am sure some $$ are saved.
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