Arrived and found package unit just kicking on package unit fired I let the package unit run for 25 minutes and came back to it and found a code of four which is a Automatic reset temperature safety inspected the evaporator coil it was clean inspected the filter it was clean the service was done in the beginning of December and we had been out there in October during the ice storm to try to locate the issue as well visually inspected the heat exchanger is well as I could and found what seems to be a crack I also found that the package unit is A 2 1/2 ton with a 14 inch return this is in adequate which could contribute to the heat buildup I will need to go back with the camera scope the heat exchanger and re-seal the curb