It will only light if the power is shut off at the main fusebox for a few minutes. If that is done, the ignitor glows and the furnace fires normally. However, the flame has a lot of dancing orange around the perimeter, which doesn't seem right, and after a varying amount of time - anywhere from 30 seconds to 5 minutes - the flame cuts off, the blower continues to blow (even after the air is no longer warm), and the trouble code indicator flashes a code four - limit cycling. Even when the furnace is operating normally during the time before it shuts off, the heated air is not terribly hot; warmish, at best.
There is sometimes a clicking noise coming from the induced draft blower motor, but it is not consistent. (I'm not a furnace guy, but I was a mechanic; I can tell when a motor is making an unusual noise
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
The ignitor will not glow again, although the furnace will repeatedly attempt to operate at short intervals, unless the main breaker is pulled again.
From the behavior of the flame, I thought I'd better pull out the burner and check for blockage, but I'm unsure if that alone would cause the burner to shut off. Any other ideas, or symptoms I should look for?