Thanks for your answer. But, I still have to question why the unit is turning itself off a hot, humid day--it never did this last summer. And, since it's a portable unit with a "unique design" that is supposed to evaporate water (hence, no hose out of a window), why is so much water in the unit? I really do think something is wrong. Thanks again for your help!
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Probably nothing wrong. If it's as hot as he/you say, the humidity level is pretty high too. The mist (if you will) that he's seeing is caused by the high humidity and the extremely high temperatures. He needs to make sure that the air intake filer on the front of the unit is cleaned or replaced regularly. That will help the AC unit to keep up without having to strain to cool. If the unit is in the hot direct sunlight for 6 hours or more per day, he should consider installing an awning over that window.This will provide some shade and help to keep the AC unit cool. Also, have your brother make sure the condensation (water) pan under the unit is draining as it should and the weep hole is not clogged.
there is most likly no problem with the machine itself. most likly its oversized. how many sq. ft. is the space. 700 sq. ft. per 12000 btu's is the norm. If its over sized the unit will cool the space quickly and not have the time to remove humidity like its supposed to. check your sq. ft. and on the unit you will see the BTU's of the unit and go from there. I hope this answers your question!!!
Some units have a dehumidify setting to overcome this as they go through a defrost. You can either manually defrost running on heating for a few minutes, or have it defrost when it goes out on fault as happened.
The flashing light indicates that there is a problem. Turn off the power and then back on. Count the flashes and it will indicate the code to the problem. There will be a time pause between the flash codes. The most common problem is the failure of the hot surface igniter .
if you remove the front cover you should see a little sensor with a wire. you need to make sure it has not fallen off its bracket or came off form the evaporator. if it looks to be ok and mounted correctly, you may have a bad sensor and it is not able to tell the temp and not shut the unit down. also to on very hot and humid days even though you have it set to energy saver it senses it still needs to run. If you turn the thermostat up when its on the energy saver will it shut off? and if you do the same on the regular setting will the comressor shut off and the fan stay running? Let me know and I can go from there. Thanks