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Hello, depending on the wiring details, which can vary with each project, it may be that zone 1 is the *master zone* and over rides zone 2. That is because it is not possible for the system to run in both heating and cooling zones at once.... so that one zone, the master zone, controls if both zones are operating.
That is the most common configuration, one master zone, and the rest of the zones or zone as a *slave zone only.