Dispatched our San Bernardino County HVAC tech to a customer reporting a strange humming noise from their AC. Their EMS system showed the unit supply 73 degree air when calling for cooling. Our technician inspected unit #6 and found no humming noises, check the remaining units and found no noise issues either. Did find #6 with a 50 degree supply temp, but the prodigy board reading 73 degrees which was the same as the return air. Discovered that the DAT sensor was missing, and that the the board was wired incorrectly. Will need to order a new sensor, and also recommend replacing both condenser fan motors as they are drawing high amperages. Shut offs are intermittent and may likely be causing the humming noise reported by staff.
