Samsung Electronics 86Troubleshooting1. Cause of problem0.7V0.7VGood DefectivePress the reset key (K3) of the outdoor unit PBAand check the display module.Is the voltage betweenthe 2 cables a square wave with DC±0.7V or moreas shown in the image below?Is there no indoor unitresponse at all from the display module duringthe tracking?Remove the communication cable that connectsthe outdoor unit to the indoor nit, and measurethe 2 outdoor unit cables with a scope.Connect the communication cable again toconnect the outdoor unit to the indoor unit.Remove all the communication connectors on the PBA ofthe indoor unit, and connect them one by one to findthe indoor unit which interferes with the communicationto check and change the indoor unit PBA.After two minutes, find the indoor unit which displays thecommunication error and check if the PBA address settings areoverlapped. (Communication error occurs if the indoor unitaddresses are overlapped.)- In this case, the communicationerror will occur in every indoor unit (2 or more units) with theaddress incorrectly set.Check the communication cable and theconnector for the outdoor unit PBA,and change the PBA.If there is no peculiarity in the address, checkthe communication cable and change the indoor unit PBA.YesNoNoYes* Essential Requirements before Changing PBA inCase of Communication Error: Refer to p.50Outdoor 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 ∙ Outdoor unit is unable to communicate for two minutes during operation. (no reception of relocation)Cause ofproblem ∙ Communication error between indoor and outdoor units and setup error of indoor unit installation quantity setup switch.4-3 Appropriate Measures for Different Symptom (cont.)4-3-4 Communication Error between Indoor and Outdoor Units after Tracking
