The symptoms sound like the flame sensor is bad. My diesel switch has a red light strip in it and the red light started flashing instead of steady red, flame sensor was the culprit.
My photocell went bad. The first indication after the burner timed out but did not light was that the red light on the switch was blinking. I called AH tech and the guy on the phone immediately identified the problem as the photocell. After a $175 purchase of a new cell, (would be less than $20 for my home heater), I was on my way.
I have a 2004 Signature. I sent a shade to The Right Track, Crofton, MD. Look them up and give them a call, they may be able to help. Great Service too! They were the original manufacturer of my shade.