I have an LG split unit that's been leaking water from the indoor part for a week now. I checked if the drain tube is clogged but it seems clean. What could it be? Do I have to call a technician or can I fix it myself?
If the tube is clean, the problem could be the collection pan inside the split unit. Often it gets clogged not from the tube itself but from the opening where water enters the pan, or from the pan itself filling up with dust and mold. Try disconnecting the power and opening the front panel of the split (if there is one), then look inside the pan. If you see dirt, sand, or algae, clean it thoroughly with water and a soft brush. Sometimes the internal tube can also be bent badly and get blocked even though it looks fine from the outside.
Another thing to check: look at how the internal air conditioning unit is tilted. If it's not slightly sloping toward the side where the drain tube comes out, the water won't flow properly. It should have a slight slope. If you notice the wall is uneven or the split was installed badly, that's your problem. Try blowing compressed air into the tube from outside too (if you can), so you can dislodge any blockages from inside that you can't see.
If it keeps leaking after this cleaning, unfortunately you should call a technician. It could be an internal problem with the condenser or the piping inside the unit, and that's not something you fix from home. But at least you'll have already ruled out the most common causes, so the technician will know right away where to look and maybe you'll spend less.
Don't touch the refrigerant pipes or the circuit board unless you know what you're doing - you risk making things worse. Besides a clogged drain tube, it could be a dirty internal filter (try cleaning it), or the condensation collection tray that's tilted wrong or full of mold, or maybe a blocked air intake. If you've already checked the drain and the filter stays clean after cleaning but the water keeps coming, then it's worth calling a technician because it could be a refrigeration problem or internal seal issue that requires specific expertise.
Guys, the tube might look clean to the naked eye but have a small blockage deeper inside, especially if dirt or algae builds up. Before calling a technician, try blowing hard into the drainage tube (the external one, you know) or better yet spray some lukewarm water inside with a syringe to flush out any debris. If the leak keeps happening, then yeah, the problem is almost certainly in the internal pan or in the collection bend like the person who answered before said - and that's when you need to disassemble the split unit, which is really a job you should leave to someone who knows what they're doing.
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