If you have a goldstar GP120CE portable air conditioner with the E3 error and it's not under warranty you may be out of luck.When I called LG, (who owns Goldstar), they said these units are not cost effective to repair so finding a company to service them is difficult. If it were under warranty they would exchange it..
SOURCE: goldstar GP120CE portable air conditioner
Sounds like a clogged condenser pipe which is common for portable Ac . It is usually due to the unit sitting low and collect more pollens an particles at floor level. A pipe cleaner tends to do the trick. Also insects tend to harvest inside the drain pipe
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