Learning Furnace Repair
I've been hiring out more lately, but I like to know how to do things even when I hire.
My 90%eff. furnace at my personal residence has gone out. I'd like to buy a book or troubleshooting reference.
With the older 80%eff furnaces I could easily diagnose most issues.
Looking for a troubleshooting guide/process.
Does anybody know of a good book or resource for learning troubleshooting especially for newer furnaces?