https://www.youtube.com/watch?v=C4W_XjX2Dsk
E5 -
Error Code
E5 Error code indicates that the water collection tank is full. To drain the water collection tank completely, leave the bottom drain cap off long enough to allow any residual water to drain out. Once the water tank is completely drained and no more water flows out, reinstall the cap.
https://www.lg.com/us/support/help-library/error-codes-room-air-conditioner-CT10000014-1432829295501
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