Repairman deterimined that the main board in my unit had a fault in it. He had to order new board which arrived five days later. Repairmant installed new board and it was faulty and destroyed the blower motor. Repair order a new board and blower motor, which was installed the next day. Before leaving the repairman ran the unit through everything and system is running fine. I told one of my friends about the experience and she is considering contact Dodrill to put her in a new system based on the lastest advertisement I shared with her.