Arrived at the customer’s home to find the cause of no power to either thermostat. Found that while the air handler is receiving 240V and it is sending 24V to the system section of the zone board. However, the zone board is not receiving the 24V to power the board itself. This is because the transformer failed and is not sending the proper voltage, most likely due to having the Apco-X and zone board on one transformer. Separated off the zone board and Apco-X to two dedicated transformers under warranty. The system began to function properly after this was fixed. Signed the customer up for the Homecare maintenance plan.