Response from RESSAC Climate Control:
Hi Matt, thanks so much for the 5-star feedback on Doug's visit last week.
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.
Returned to a home goods store in Redlands California to complete approved repairs. Two of their Lennox air conditioners needed work, including a VFD and condenser fan motor replacement. RTU #3 was up and running after new fan motor, blade and capacitor were installed. #5 was also operational and replacing the VFD and a control board. Confirmed no more issues seen with EMS.
Another Lennox unit at a business in Redlands needed repairs today, a VFD replacement. After swapping out the necessary parts, our technician confirmed all systems were operational by checking out with the monitoring company. Job complete.