In this article we will talk about the U4 error in Inverter AC of Daikin company. This is a communication error. A communication error occurs when indoor kit is not connecting with outdoor kit.
Whenever indoor to outdoor wire connection is made, it should be done well. The wire which is attached to the point in the indoor should be attached to the same point in the outdoor wire.
Also we should check all the wire jacks in indoor and outdoor unit kit if any jack is loose then fix it. Apart from this, any component of the kit in the outdoor unit may have burnt due to which the kit in the outdoor unit may not be working properly. All AC Error code list.