The customer popped open the hatch because his overflow had water coming out of it and saw a gigantic sheet of ice on the wall of the tower. Now he is scared it is going to come off and wreck the sump. The tower goes to a heat exchanger for winter chiller replacement.
I checked the system out and it seems ok. The fans are running to cool the water to 45-50 degrees for the exchanger and there is a HW fill if it gets to 40. Tower is 3 years old. He may have had it do this before but never opened the hatch to see it. Opinions?