Why do air handlers freeze up in central ac units?
From time to time, air handlers will develop ice on their coils which causes the condenser to run constantly without any cooling benefit inside the house. Several causes could be the problem. It could be blocked air flow in the air handling unit caused by dirty filters, insufficient air flow to the air handling unit or insufficient coolant in the system.Drainpipe is BlockedWhen compressors run, the condenser is circulating the coolant within the system, and water condenses out of the air. A functional drainpipe should have evidence of dampness or water dripping from it almost all the time. If the pipe or soil around the pipe is completely dry, there may be a blockage inside the pipe.Dirty FilterDust from the house is always collecting on the filter; too great an accumulation will block the proper amount of air blowing over the coils, causing them to become too cold, and eventually freeze over.Registers BlockedSometimes people block the flow of air to rooms they are not using. Optimally
