Test Operation ESIE12-0674 Field Setting1.5 Failure Diagnosis at the Moment of First Installation• In case nothing is displayed on the remote controller (the current set temperature does notdisplay), check for any of the following abnormalities before you can diagnose possiblemalfunction codes.• Disconnection or wiring error (between power supply and outdoor unit, between outdoorunit and indoor units, between indoor unit and remote controller).• The fuse on the outdoor unit PCB may have run out.• If the malfunction code “E3”, “E4”, “L8” or “U0” is displayed on the remote controller, there is apossibility that the stop valves are closed.• If the malfunction code “E3”, “E4”, “L4” or “L8” is displayed on the remote controller, there is apossibility that air inlet or air outlet are blocked.• If the malfunction code “U2” is displayed on the remote controller, check for voltageimbalance.• If the malfunction code “U4” or “UF” is displayed on the remote controller, check the inter-unitbranch wiring connection.• If the malfunction code “UA” is displayed on the remote controller, there is a possibility thatconnection is with incompatible indoor unit.
