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The unit is about a month old, I followed your suggestion and tested the limit switches and none of them had been tripped. So I kicked the furnace back on the flame kicked on, the ignitor kicked off - burned for ~10 seconds and flame went out --- same old thing. So I followed your suggestion...

Everything appears right I have the white to white, black to black, and the ground ran to the frame of the unit.

I am running natural gas and the flame seems to be burning clean, it is blue with little to no orange or yellow. When I removed the flame sensor it appeared to be clean other than the discoloration which I would think would be normal, there was a slight grey film that wiped of but other than...

I have a new Mr. Heater Big Maxx furnace that was cycling the burner on and off. I removed the flame sensor which didn't seem to be dirty but a bit discolored (blue/black) and cleaned it with a pot scrubber. I replaced it and furnace worked great for a day but now it is back to same old thing...