Samsung Electronics 84Troubleshooting1. Cause of problemYesIndoor Unit Installation Quantity Setup Switch of OutdoorUnit Compare and check the set value and the actualnumber of indoor units installed.Press the reset key (K3) of the outdoor PBA, and check thedisplay module to check for the quantity of indoor unitsthat respond to the tracking.Remove the communication cable which connects the outdoorunit to the indoor unit, and measure the 2 cables of the outdoorunit with a scope.Is there no sign ofthe indoor response on the displayduring tracking?Check the communication cablewhich connects the outdoor unit to the indoor unit.If there is no peculiarity, then connect the indoor units one by one to findthe indoor unit that is interfering with the communication for inspection andchange the indoor unit PBA.Is the voltage betweenthe 2 cables a square wave with DC±0.7V or moreas shown in the image below?Are the number ofactual installed indoor units and the set value for theinstallation quantity setupswitch the same?Correctly set the indoor unit installation quantity setupswitch of the outdoor unit, and press the reset key (K3) ofthe outdoor PBA to re-execute tracking.After 2 minutes, find the indoor unit whichdisplays the communication error for the indoor units, andcheck for overlaps in the PBA address setup.(If the indoorunit addresses are overlapped, then a communicationerror will occur).- In this case, a communication error will occurin every indoor unit (two or more units) withthe address incorrectly set.Change the indoor unit PBA after checkingthe communication cable when there isno peculiarity with the address.Check the communication cable andthe connector of the outdoor unit PBA,and change the PBA.YesNoNoNo* Essential Requirements before Changing PBA in Case ofCommunication Error: Refer to p.50Yes0.7V0.7VGood DefectiveOutdoor unitdisplayIndoorunitdisplayDuct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation Timer Turbo 24 27: ON : Flash ×: OFFJudgmentMethod ∙ Communication error between indoor and outdoor units.Cause ofproblem ∙ Refer to the judgment method below.4-3 Appropriate Measures for Different Symptom (cont.)4-3-3 Communication Error between Indoor and Outdoor Units during Tracking
