Having had many in the past and had a few problems the first things to check are the filters and vents (flow RESTRICTIONS) check the temp sensor "if you can get to it", usually in the lower center of the evap coil, just plugs into, holding onto, the coil and sensing temp.
Possibly investigate and install the "tent in vent" mod (do adv search on this forum) to increase the flow. If like ours the main unit is not accessable from inside ie. "two return vents on either sides of rm and circular blow vents for output" two more options would be to increase flow by keeping the fan speed up and or adding /getting a dehumidifier.
a Dehumidifier will lesson the moisture in air reducing freezup, also increase effiency "Feel", as dryer air promotes evaporation feeling cooler
As others have mentioned if these don't do it. There may be a prob in system, have a qualified service tech, check coolent level and find the leak useing correct dye, have the leak repaired and then have proper soldered on service ports added the system. Must then be evacuated properly (vacuum pump required!!!) oil and refrigerant added
Sounds complicated expensive, however only 3 alt's 1. Keep fixing it a couple times a year 2. Replace unit now 3. Properly repair it now and it will probably function fine for years to come.
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As others have said don't be too quick to jump on low freon. These are sealed units. If it is low, it has a leak period. The most likely cause is low airflow. Do the simple things first. Check your filter, look for any blockages, pull the shroud off on the roof and check the coil a lot of dirt and bugs can get in there going down the road. That said there are conditions, generally high humidity, where you have to run in high.
The following is a quote from Dometic and most manufactures have similar " Poor or improper air flow, short cycling, a dirty filter or placing the thermostat on its minimum temperature setting and the fan on low speed in high humidity situations can cause evaporator freeze-up." Your unit may be operating fine.
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to thicken the plot, last summer in charleston I noticed a water drip in the basement area. I tore the shower apart only to find it wasnt leaking. After much investigation it was coming down the inside of the outer wall. I figured it would be due to condensation on the aluminum frame from the heat outside and the air running on high inside. we have also always noticed water forming on the vents in the ceiling when the ac is running. does this add anything to the diagnosis?
Sounds like a plugged condensate drain, if that's happening. I've had the drain in my truck plug up and had cold water run into the cab; real exciting on bare feet! Invariably, I would also start to get freeze-ups and that nasty mold smell, too. Cleaning out the drain usually fixed the problem.
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