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did you get the pic?
Right. They were never in the notch. That I understand is a permanent open. I moved them to the right away from the notch, which I assume is closed. But it seems that one came on despite this fact, and the fact that all thermostats are turned into the lowest position. Also the level doesn't seem to move smoothly. So I suspect that this "box" will have to be replaced?
Not onsite. But I will contact you when I have access and a bit of time to do it. The thermostat seems a new model, and the runaway heat only happened once. However, none of the zones have operated truly well or accurately controlled. I assume there is a time delay for the system to turn on and off, but it seems worse than expected. This winter, before I knew about the notch, the system turned off and would not turn ON in any zone at all despite all thermostats being turned fully up.. Then suddenly it came on the next day. Thanks for the help so far.