Don't Panic! Fixing the E4 Error Code on Your Air Conditioner

E4error code air conditioner.
However, for the most part, the E4 error code means that the unit is entering defrost mode. You will hear a difference in the fan speed when your unit changes. When the fan motor slows, it sounds like the unit performs as an air purifier or dehumidifier. It basically just passes air over the unit without cooling it.
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