AC icing up

I had that happen one time on my 07 KZ. It was a cheaper trailer with a knob like a car ac that you turn toward the blue side for cold air and to the red for warm air. It was really hot outside and I had it turned all the way to the cold side. From then on, I made sure I went just short of all the way on the cold side and it worked fine from then on. I don't know if that is your problem or not, but it fixed mine. There are a lot of knowledgable people on here, so somebody else should have some other ideas for you. Good luck, and I hope it is a simple fix.

Mine did the same thing. My converter was putting to much power out.The dealer told me my AC was going into safe mode.He talked me though how to check it. While i was checking the converter got worse my lights stopped working. So i ordered a new one everything works great again.

All I know is I replaced the converter and it works now.

I had the thermostat set at 70, fan on high.  The humidity last weekend was in the teens (colorado).  I tried opening the vents on the unit as well instead of relying on the just the ducts.  Also popped the cover off to make sure the sensor was in the fins, it was.  Several of my friends had theirs running and their trailers were much more comfy. 

Hi Tony & Shell; First, I offer these comments based on 35 years in the HVAC trade. The most common cause for ac freeze up is low air flow, which has been addressed, IE, dirty filter, dirty coil, blocked return or supply etc. Being a new unit, the first two can probably be ruled out. Another common cause is the thermostat. First, You can't trust the t/s setting. Most thermostats today are electronic although some cheaper models may still use bi-metal elements. As the name implies, it's two strips of different metal, fused together that expand & contract at different rates causing the element to bend with temperature changes. The first are more accurate but they are all calibrated in controlled conditions when made and rarely will any two cycle at the same temp. You should check the reading with a good thermometer so you know how close to the actual temp it is. Any source of heat close by - lamp, sun through window etc can keep the t/s calling. A 70 degree setting is borderline low if your t/s is off a couple of degrees but with a properly operating a/c the temperature should get uncomfortably cool before it freezes up. Humidity in the teens shouldn't factor in. High humidity increases the heat load on the unit and would be less apt to cause a freeze up. Since it didn't cool at all the last time you tried it, your unit is probably bad. If you try it again, set your t/s above 70, close the big vents in the main supply and return cover(this will prevent short cycling air between supply and return) make sure all the duct vents are open. Observe air flow, these things move a lot of air. Check the temp drop from return to supply using the same thermometer. Should be in the neighborhood of 15 - 20 degrees. Much over 20 indicates poor air flow. There could be some insulation or other material from construction blocking the coil. You can drop the filter cover down and look up inside. You could also pull the roof cover off but I would be really careful not to do anything that could void your warranty. Can't imagine why you have to wait 2 months for service on a new trailer.