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limited info generic answer it can but it also could have a broken wire or problem with a control circuit --stuck relay - wiring problem with the hvac unit
Go to zone 3 and see if any air blowing out. Likely have a stuck damper. If you can access the dampers tap on the duct or motor a few times, maybe free it up.
Keep in mind you have the same terminals on the damper. 1-4-6. be sure both board and dampers are wired the same for spring open/power closed. I cant remember if that 311 sends power with a call or not( if power is being sent when light is on), but once you have double checked the damper wiring either verify with a meter that power is being sent or verify air flow. if it is then backwards simply reverse wires on board. I suspect it sends power when light is on, that is why zone 3 is lit. (there is no call for cooling on 3, therefore it is shutting the damper) YES, the damper that is not really there. Let me know, hope this helps. The damper that is trying to cool should NOT be getting any power, wire accordingly.
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