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Hello, perhaps one of you could offer advice.

New house (to me) and I'm curious about something.

I have a 3-zoned system controlled by a TrolaTemp board.

Zone 2/3 have a generic...

Yes, actually. The unit is for the daylight basement, and as such, used infrequently (never gets too hot down there). We went to run it for a while to give it some exercise and noticed it wouldn't...

It's what any of us do. Granted, I may not know all the terminology necessary for HVAC work, but I'm learning. (They didn't teach useful, practical things in electrical engineering courses.)
...

Meaning the contactor?

My first time trying to troubleshoot an HVAC unit, and I'm stuck. (Carrier 1 ton, can't recall the model number off hand as I'm at work)

If the AC is set to ON, the 3A fuse on my board keeps...