I have an intercity furnace with a general 90 50a50-110 controller that isn't allowing the furnace to heat. When the unit is powered up the led flashes once, exhaust blower runs, I hear some clicks but it never ignites. What's wrong?

So the ignitor doesn't glow is what I am gathering... if so, replace the board. There is an upgraded board for that part #, I believe it is White Rogers # 50E47-843