Help, my apollo 30SI has stopped working. Originally it would fire up and stop after 10 minutes, i thought it might be overheating. Then because it was summer i left it a couple of weeks and it doesn't fire up at all now. The pump runs constantly and the correct lights are on the PCB. I was thinking to replace the ignition PCB, Hi & Lo thermostats and maybe the air pressure switch as well to be on the safeside. Would that cure it? I figure that would be cheaper than calling someone out and also i dont want to replace the boiler as i\\\'m moving soon. Cheers.