SiUS12-814 TroubleshootingService Diagnosis 1575.28 Anti-icing Function in Other Rooms / Unspecified Voltage(between Indoor and Outdoor Units)RemoteControllerDisplayUA, UHOutdoor Unit LEDDisplayA 5 1 1 2 1 3 1 4 1Method ofMalfunctionDetectionA wrong connection is detected by checking the combination of indoor and outdoor units on themicrocomputer.MalfunctionDecisionConditions Operation halt due to the anti-icing function in other rooms Operation halt due to unspecified internal and/or external voltages Operation halt due to mismatching of indoor and outdoor unitsSupposedCauses Operation halt due to the anti-icing function in other rooms Wrong connections at the indoor unit PCB wrongly connectedTroubleshooting(R7151)CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.NOYESNOYESNOYESCheck the model number.Check the combination of all themodels being connected.Error-displaying air-conditioner running?Supply voltage asspecified?Normal?The anti-icing function isactivated in other rooms.Refer to A5.Correct.Reconnect.
