All systems upon arrival were freezing over and not providing any cool air to flow into the building. I then found that all the filters were two years old, I started by replacing all of the filters. After the filters were replaced the systems started to run properly. I then found that rtu 2 was sill icing up because the blower motor was not operating. This is due to the manufacture installing the incorrect fuse sizes on the fan motor. Ordered new fuses and installed. I tested operating upon completion and as of now everything is up and working just fine.