While using cooling or heating, System Turn off and display E458 Error codeCheck point RemarksE458 Error is related with outdoor unit fan Error.Especially, If system have a some problem in fan, in heating mode , it will be happened.And In auto address setting, without pipe checking operation must be happened it.Check to outdoor fan operation.Step 2 If outdoor fan operation is clear, start to pipe checking operation.GuidanceWhen Auto address setting is finished without pipe checking operation, in heating mode, outdoor unit refrigerantdistribution control is malfunction.It make our system to confuse it