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The E02 error code refers to ignition failed after 5 retries. have they replaced ignitor, cleaned burner?
We usually start with the simple things if burner is failing to light every time. I would start by pulling the burner and checking/cleaning. Perhaps replace ignitor again. These are things that can affect the way it lights.
Maybe just a coincidence. It would cut down combustion air to it, so that's not good.
Yes, that's combustion air (intake).
Did you have additional questions?
On page 28 of this manual, it shows the E02 code and what to do if there either is a spark, or no spark. So that would be where you start. It lists all the things to check.