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You likely you a coil cleaning. If you have access it’s something you can do just using caution as to not bending any fins. A small brush of some kind and a pump sprayer. Also take a water hose to the outdoor unit and clean that coil as well. Again being careful not to get water into where the electric is. Once that you can check your temp splits, return air temp vs supply air temp should be near 20 degrees. I.e. 75 return temp 55 supply temp.
Clean indoor filter , and coils in unit (you must remove from window and remove top from unit to expose coil, After cleaning coils prop up unit so it slopes to rear and spray back and forth at bottom of front coil until drain is clear . Never turn unit upside down , and do not get water inside of fan motor . Also clean evaporator blower wheel . With unit clean and drained out place in direct sunlight for at least 2 hours to completely dry before replacing top and reinstalling in window , or just drain out , reinstall and leave unit unplugged for at least 24 hours to dry before testing . If unit is clean and still icing , check to see if thermostat works (place object in front of unit to direct cold air from top of unit onto thermostat temperature sensor and compressor should cycle off, if not replace thermostat . If unit still ices you will need a pro to repair sealed system of unit or simply buy a new one .
Sounds like you're using it when the outside temp is cooler than the inside temp. when this happens, frost will build up on the condensor. Turn the unit off until the ice melts off with a shim under the unit tilting it back towards the outside of the window to drain. If it continues to drip after melting all the ice off and letting it dry out, you have a small leak in the condensor, (unit must be old or worn out) that the freon pressure has leaked out causing it to condensate more. A good checklist would be to check the level of the unit, make sure the coils are clean and not bent, the age of the unit and for small areas of corrosion or white marks on the condensor before replacing it.
Check the condensate drain port for blockage and clear the blockage.
If the cover was on upside down, it is possible that it was impeding the air entering the coil.....this could have caused the coil to frost up....during your time to shut the unit off and inspect, the frost/ice started thawing and dripping into your trailer.
Here are the main items you want to address:
1. Ensure the drain is free and clear.
2. Ensure the air filter is clean and properly in place.
3. Ensure the evaporator coil is clean.
4. Ensure the covers are properly in place. ;-)
I hope you find this information to be very helpful to you moving forward. Let me know if you have any questions. Please don't forget to leave a rating for me. :-)
MAKE SURE THE FILTER IS CLEAN AND COLD COIL IS CLEAN . JUST REMEMBER 70 OUT SIDE AND 70 OR LOWER INSIDE AND YOU HAVE A ICE CONDITION. 75 INSIDE AND 75 OR HIGHER OUTSIDE KEEPS UNIT FROM ICING UP. IF ITS LOW ON FREON IT WILL ALSO ICE UP. MOST OF THE TIME THEY DONT LEAK FREON BECAUSE THEY ARE SEALED SYSTEMS
IF YOU CLEANED THE FILTER AND THERE IS NO DIRT ON COIL, YOU MAY BE RUNNING IT TO LOW FAN SPEED. REMMBER IF IT IS ABOUT 70 OR BELOW IN HOUSE YOU NEED MORE HEAT ACROSS COIL INSIDE , TURN AC TO HIGH SPEED AND ICE SHOULD MELT. IF IT DOSENT TURN T STAT TO HIGHER TEMP.
it is likely low on coolant or as some say "freon" that or the indoor fan motor has not run properly. let it thaw completely by shutting it off and just turning on your fan switch from auto to the on positon. if you begin to feel air flow eventually you need coolant added b/c you probably have a leak from the system being old
If the coil is clean, then have a tech check for a low charge. This will cause the coil to freeze up. Humidifers are known to lose gas and owners aren't told this so end up buying new one and scraping the old one. Trust me on this. I have seen this many times. I repair high end machinery as my business.