If the problem is just the coil icing up, open the quick dump vent until the TT is cooled and the humidity drops, then close it over time. That has worked well for me. The ducting system sometimes does not allow sufficient air flow to keep the coil from freezing up if it is very hot and humid. If it is a loss of freon issue, the manufacturer is aware that they had a bad shipment and that they can corrode and lose the coolant. Contact your dealer or a local RV repair facility that sells Dometic and they will replace it. it is about a 2hr job.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels