I could use some help understanding flame rectification. I've done some research online and have a decent understanding how it works when there is a separate ignitor and flame sensor. My challenge is when the ignitor and flame sensor are combined. I had trouble with a unit that would drop out after the ignitor cooled,turns out it was due to ignitor resistance. Just need to understand why, any suggestions on where to look. I will be teaching this to my coworkers.