Most of the companies i worked for wouldn't troubleshoot zoning.
(we do things a little differently out here in L.A.)
now i'm at a company where knowing it sure would help.
i've read about how zoning is supposed to work, but troubleshooting is a different story
(i also have info for Carrier Infinity type zoning)
had a problem at a house where the upstairs dampers were closed with both upstairs and downstairs t-stats calling.
a tech told me one time, the way to check a damper is to slice open the duct and put your hand in there.
i didn't want to do that.
1) is that a standard proceedure?
2) is the duct with the alan wrench adjustment the bypass?
3) does every zoning system require a bypass?
4) what would you estimate the frequency is of having to replace a control board?
5) are most dampers spring open , 24v power closed?
6) i replaced a small circuit control board that seemed to be milivolt. are those common now?
7) what are the most common problem?