My original 1990 Lennox oven stopped working and the HVAC repairman told me that my ignition board module was malfunctioning causing it to not sense a lit pilot and not ignite the burners. I was offered 500 dollars for a replacement board, fair or not, I didn't want to spend so much money on an oven, uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu, I could at least get a lot, but I wanted to get a very tight one. My board model is Lennox SP745 and I read that this 780-845 is a replacement for mine so I ordered it. I turned off the oven and changed the circuit board in 5-10 minutes. Easy as pie, just note what color wire goes where on the old board and then connect it to the new board. The only difference is that on my old board the spark wire was labeled "IGN" but on the new board it was labeled "SPARK". I turned it on, waited a few minutes and BAM, the burners lit and there was no sweater or jacket left in the house! I will update if anything changes. **** UPDATE ***** 25 month update: still works! The only small problem with my stove at the moment is that during a harsh winter the pilot light goes out once a week and then cold air blows. Luckily all I have to do is turn off the switch for 10-20 seconds and the pilot will light up again and warm up again. I don't know if it's the ignition module or something else, this ancient stove will need to be replaced soon.
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