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First you need to make sure the filter is clean to allow good air flow through the evaporator. If the filter is clean make sure the evaporator is not plugged up with dust and lint. If all that is ok your problem is the a/c BTU's is to big for the size room you have the a/c in and it is getting the room too cold. If that happens the evaporator will ice up and will not cool the room.
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Two things generally cause this problem. High outside humidity and a clogged air in take filter. Allow the unit to thaw completely, remove the air intake filter and clean it. Allow the filter to completely dry, before reinstalling. Never operate the AC unit without the filter in place.In addition. the unit may not have enough downward tilt at the rear. Generally 1/4" to 1/2" is required. so water will flow to the rear of the unit to the drain hole.
What may be at issue is evaporator icing. Some units cycle the compressor, others control the refrigerant to keep the evaporator temp just above freezing. If allowed to continue the evaporator would freeze over and air flow would stop....
Check and see if that is the case...
check the filter located behind the front panel it usually snaps out also make sure the drain holes on the out side bottom of unit are not stopped up and that the unit is leaned back slightly for drainage freezing is a sign of low air flow or low on freon the coil actually gets colder when freon starts to leak out hope this helps with your problem
Have someone check the run capacitor of this unit. If the run capacitor is bad over shorted it can cause the unit to run and short cycle on a current overdraw. This makes for an electrical imbalance in the compressor motor. Next step is the compressor is faulty.