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Does indoor or outdoor either one come on? Do you have a volt meter for troubleshooting?
Can you do some hands on troubleshooting and do you have a meter?
Go to main thermostat and remove cover. Disconnect wires from R, Y and G and twist them together and tell me if fan and ac come on.
It will be one of the zone thermostats.It will have wires to all the terminals.R,Y,G,and W.
Take your time
To be honest,I am not familiar with that zone board and would be guessing to try to troubleshoot it.I am going to open to other experts who may be rather than guess.
I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk and delay getting assistance..Please stand by to see if another expert can assist further.