I have a Glow-worm Micron that is making a vibrating noise. The noise seems to emulate from the extractor fan on the top of the unit. It is a Sifan Systems Model 227034 code No. WFFB1701-031. Do the bearings wear out? The boiler is approximately 2 years old. Should I change this extractor unit if so where might I get one from?

Joe Pickering, February 2006

check the fan blades for build up of dirt they may require cleaning

dave taylor, February 2006