This is a pumping sound of the water in the air conditioner and heard when the water is pumped out from the air conditioner in cooling or drying operation. Split systems vrf inverter multi system 1 split systems whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote controller eroor code indoor outdoor unit green led power pilot lamp and microcomputer normality pilot lamp or red led check pilot lamp. If the malfunction still can t be eliminated please contact local dealer or qualified professionals.
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