Hi... my model DGU08012UB is having an issue. The induction motor comes on,ignitor lights burner and the burner runs for 3-5 seconds and shuts down. The induction motor continues to run. The burner will not come on again. If I power it down,it repeats the cycle. I do not see any diagnostic error lights... any thoughts?

Check out the roof jack for holes ,cracks,splits. The roof jack is the flu pipe that goes up through the ceiling,, the slightest hole will cause this problem ,
Now I`m assuming (could be a bad guess) that the colman Evcon is in a mobil home

I would say you need a new ignitor as it is also the falme sencer