Tech found system #1 with the service disconnect off at the airhandler. After power cycle, tested thermostat operation and the thermostat was not sending 24v to the Y,W and was only sending 17V to O. Tech recommended replacing the thermostat. Jeff Cupp approved the repairs. Tech tested system in heating and cooling. System #1 is operating properly at this time, tech checked and heard the ERV near air handler #1 operating. Tech reached out to Jeff to verify findings and stated that he was told that the ERV on hallway 400’s was the one not working. Tech checked the ERV and tech heard the motor operate, tech was unsure if This style ERV has more than 1 motor within. Jeff was going to check with someone from the region to find out where or what exactly they were referring to.