When the ambient temperature is below 15º C / 59ºF, the condenser begins to freeze due to the mixture of the refrigerant that produces the condensation and the cold air that enters in it, so the NUBE makes the effort to defrost, so we recommend moving the unit to a warmer room to avoid lowering production efficiency. If the "defrost" indicator stays on for a long time, it is recommended to turn off the unit for 2 to 4 hours so that the ice melts faster.