Over All Rating Reviews : 
This book did not enable me to more skillfully troubleshoot my Lennox G23 furnace. This furnance has been unreliable for failures in the electrical control circuits. Home handymen with a penchant for electrical control circuits who expect to troubleshoot and repair beyond change-a-neering will not get much new from this book assuming they already know the obvious like checking circuit breakers. The book is not sufficiently detailed in describing how furnace control circuits mediate the sequence of events from a new temperature setpoint to its fulfillment. The approximately 150 words devoted to this subject for a furnace of my type are dissociated from references to electronic devices and function modules. For someone who is reasonably technical to begin with, most of the text dwells on common sense matters. When it is time for the author to be more technical he refers the reader to one of the many figures, diagrams and troubleshooting charts taken from manufacturers user manuals. These manuals are usually good references for experienced technicians already working in the field but one would expect the author to offer additional explanations since they tend to be poor learning materials. He doesn't. One would expect the author to describe the various devices, discuss their failure modes and explain how one would determine if they were working or not. There is little of this. A guide to the symbols of the control circuits would be helpful, but no, nothing. In fact, the author fails to discuss key devices like flame rollout, air prove and primary gas limit. This book is not a good repair guide for my expectations primarily for its lack of attention to devices, control circuits and process. For a book that claims to be written for heating system professionals this is serious omission.
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