People ask me all the time what my most common repair is. Since I service just about any model out there and keep records of this sorta thing...here's what the data says. This is a snap shot from Oct 2007 to April 1, 2013 by models.... Englander - PDVC and PDV - lower auger motor Harman - all models - igniter Enviro - 2002 through 2008 models - auger bushings/ auger motors Lennox Country Winslow - POF switch Breckwell - all models - exhaust blowers Englander - PDVC and PDV - igniter Breckwell - P Series models - Convection blower Lennox Whitfield - Photoeye Whitfield - Advantage - Combustion Blower Harman - models with chain drive - Chain and sprockets Enviro - 2006-2008 models - Control Boards This isn't necessarily a snap shot of what needs what...but rather what I go to and what they need. You have to take in to consideration the volume of each model which I service and the density of models in my service area. Just thought I'd put it out there.