Worcester 28i RSF Combi?

Got same problem can hear the system go on and can hear flow and a humming noise coming from the boiler but no hot water or heating. Am I supposed to see a light/flame in the small glass viewing area? As I have nothing in there, I have tried turning the heat control knob fully anti clock wise then fully clockwise but cannot see any flame or hear any activity. I have tried pulling off the red tube and blowing into it and can hear the click on and off so that does not seem jammed. I can just see me getting somebody out and paying an extortianate amount for what maybe a easy/small job. Had the pump replaced about a year ago. Damn this boiler.
Sorry I put this in the answer by mistake should be a new question relating to same thing.