Found main house ac frozen and not letting air pass threw the coil. This problem has occurred in the past and will continue to freeze due to high static pressure unless we fix the duct work for the this system and the other two system. We have talk with customer about this issue before let customer know to turn the ac off threw the night and tomorrow set the temperature to 74 in the morning and not to touch it the rest of the day so that the ac is not working to hard to cool the area and see if that will help the freezing from happing. If coil freezes again we will need to talk about possible solutions so that the systems can work at peak performance. Not charging customer the diag fee due to us being out there 4 days ago.