They don t work correctly except in cool mode.
Lg inverter air conditioner error code c6.
But when in auto mode units do not cool or heat been told all units must be in same mode for them to work.
If so then the e4 code is normal.
Just installed 3 6000 and 1 18000 units new condenser units cool fine.
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Learn how to use update maintain and troubleshoot your lg devices and appliances.
If the portable air conditioner frequently goes into the defrost mode and isn t cooling properly check the air filters and clean or replace filters if dirty.
If there is a fault on any lg universal unit a two digit number will appear on the remote controllers led display if the unit does not have a remote controller the fault will be displayed using the led s on the front of the indoor unit.
This is not true.
After the air conditioner exits defrost mode and resume normal operation check the unit to see if it s cooling properly.