Warranty call on a ruud heat pump split system itâ€™s about right at a year old. Found the system a block of ice ,deice the system all I could. Checked the dampers to make sure they were opening and closing ,also check the refrigerant pressures. At this time I cannot find a failure ,I have instructed customer to keep an eye on the upstairs damper as it may have got stuck closed . Both dampers are operating normally. Customer is going to let the system run and fan only for several hours to finish deicing.