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When a zone is switched on, the damper of that zone closes

If the damper of a zone closes when said zone is switched on and demand is generated in it, it could be the case that the polarity of the actuator's output is not correct. (Red / +) and (Black / -). Check it.

If the polarity is correct, check whether the actuator operates properly ( The actuators of my dampers do not operate ).
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