Samsung Electronics 88Troubleshooting4-3-6 Internal Communication error of the Outdoor Unit C-Box1. Cause of problemReplace Main PBARestart operation after connecting the InverterPBA2 CN31(when the Comp. applied one :Inverter PBA1) connector. (Check the 3, 4 Pin short)* Service after turn off the Main Power.NoYesIs the jumperconnector connected to CN31 of Inverter PBA2(when the Comp. applied one :Inverter PBA1)?Restart operation after checking the InverterPBA2 CN31 and PBA2 CN32 Communicationwire/Connector.(3, 4 Pin Short)* Service after turn off the Main Power.NoYesYesIs Inverter PBA1 CN32 and Inverter PBA2CN31 connector accurately connected?1) Check the Inverter PBA1 CN32, CN91 andFan PBA CN12 Communication wire/Connector.2) Restart operation after connecting the HubPBA CN97 and Fan PBA CN13 connector.* Service after turn off the Main Power.1) Check the Main PBA : Main PBA TX circuitinspection2) Check the Hub PBA : Hub PBA TX circuitinspection* Service after turn off the Main Power.NoNoYesIs InverterPBA1 CN32 and Fan PBA CN12 connectoraccurately connected?Does FAN PBA LD22/LD32 (LED) blink?Two Comp. applied to the modelOutdoor unitdisplay - All boards of outdoor unit are not communicatingIndoorunitdisplayDuct, 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 Turboϧ ϧ ስ ስ ϧ ϧ ስ ስ ϧ ϧ ስ ስ: ON : Flash ×: OFFJudgmentMethod ∙ Main PBA detecting uART communication other PBA. (Hub, Inverter, Fan)Cause ofproblem∙ Communication wire inside the C-Box is unconnected∙ Main PBA defective4-3 Appropriate Measures for Different Symptom (cont.)
