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I apologize for the delay. Do you still need assistance? If so, I'll be happy to help. If not, I can request a refund for you.
Okay, great! It is possible that the controller is bad, but that's an expensive part so I'd like to rule other possibilities (thermostat, shorted wire, setting on zone panel, etc) out before we jump to that conclusion. When you say you disconnect the thermostat, how is it that you're doing that? Are you taking the face off, or actually disconnecting the wires? Also, can you please provide the model # of the zone panel. You can also attach photos to this chat if you would like to.