My Glow worm 24 hxi has developed a heavy vibration. It's Ok on water heating only but vibrates after a few minutes operation on central heating. It has got gradually worse over a couple of weeks. Thought it might be the pump so changed that but didn't reduce the vibration. Anyone have any suggestions?

AllanB, October 2008

Thanks for that heat tex. Not likely to be fan vibration then?

AllanB, October 2008

get glow warm to come and calibrate the burner as its gone out of gas air ratio sorry it needs specalist tools but its the only way to cure it

heat tex, October 2008