SiUS181631EA Troubleshooting for Outdoor UnitTroubleshooting 2617.31 System is not Set yetError Code UFMethod of ErrorDetectionOn check operation, the number of indoor units in terms of transmission is not corresponding to thatof indoor units that have made changes in temperature.Error DecisionConditionsThe malfunction is determined as soon as the abnormality aforementioned is detected throughchecking the system for any erroneous connection of units on the check operation.SupposedCauses Improper connection of transmission wiring between indoor unit - outdoor unit Failure to execute check operation Defective indoor unit PCB Stop valve is left closedTroubleshootingNote: Wiring check operation may not be successful if carried out after the outdoor unit has been off formore than 12 hours, or if it is not carried out after running all connected indoor units in the fan modefor at least an hour.CautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.Replace the indoor unit PCB(control PCB).Wiring check operation maynot have been carried outsuccessfully.After fixing incorrect wiring,push and hold the RESETbutton (BS5) on the servicePCB (A2P) for 5 seconds.∗ The unit does not run for upto 12 minutes.After fixing incorrect wiring,push and hold the RESETbutton (BS5) on the servicePCB (A2P) for 5 seconds.∗ The unit does not run for upto 12 minutes.YESNOYESNONOYESOpen the stop valve (s).YESNOAre the stopvalves opened?Is thecheck operationcarried out?Is thetransmission wiringnormal?Is the transmissionwiring normal?(R22107)
