Panasonic CU-3E19RBU-5 Service Manual

Also see for CU-3E19RBU-5: Operating instructions

Panasonic CU-3E19RBU-5 Service Manual Manual pdf 63 page image

6315. Troubleshooting Guide15.1 Self Diagnosis Function The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printedcircuit board in the outdoor unit can be used to identify the location of the problem.Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditionersystem. If the problem is solved and operation returns to normal.LED 1 illuminates and others LED are off.DiagnosisdisplayAbnormalityorprotectioncontrolLED 6 LED 5 LED 4 LED 3 LED 2 LED 1 AbnormalityjudgmentProtectionoperation Problem Check locationH11Indoor/outdoorabnormalcommunicationO After operationfor 1 minuteIndoor fan onlyoperation can startby entering intoforce coolingoperationIndoor/outdoorcommunication notestablish Indoor/outdoorwire terminal Indoor/outdoorPCB Indoor/outdoorconnection wireH12Indoor unitcapacityunmatchedO 90s afterpower supply -Total indoor capabilitymore than maximumlimit or less thanminimum limit, ornumber of indoor unitless than two Indoor/outdoorconnection wire Indoor/outdoorPCB Specification andcombination tablein catalogueH15CompressortemperaturesensorabnormalityO O Continuous for5s -Compressortemperature sensoropen or short circuit Compressortemperaturesensor lead wireand connectorH16Outdoorcurrenttransformer(CT)abnormalityO O - -Current transformerfaulty or compressorfaulty Outdoor PCBfaulty orcompressor faultyH27Outdoor airtemperaturesensorabnormalityO O Continuous for5s -Outdoor airtemperature sensoropen or short circuit Outdoor airtemperaturesensor lead wireand connectorH28Outdoor heatexchangertemperaturesensor 1abnormalityO O O Continuous for5s -Outdoor heatexchanger temperaturesensor 1 open or shortcircuit Outdoor heatexchangertemperaturesensor 1 leadwire andconnectorH32Outdoor heatexchangertemperaturesensor 2abnormalityO Continuous for5s -Outdoor heatexchanger temperaturesensor 2 open or shortcircuit Outdoor heatexchangertemperaturesensor 2 leadwire andconnectorH33Indoor/outdoormisconnectionabnormalityO O - - Indoor and outdoorrated voltage different Indoor andoutdoor unitscheckH36Outdoor gaspipetemperaturesensorabnormalityO O Continuous for5sHeating protectionoperation onlyOutdoor gas pipetemperature sensoropen and short circuit Outdoor gas pipetemperaturesensor lead wireand connectorH37Outdoor liquidpipetemperaturesensorabnormalityO O O Continuous for5sCooling protectionoperation onlyOutdoor liquid pipetemperature sensoropen or short circuit Outdoor liquidpipe temperaturesensor lead wireand connectorH64Outdoor highpressuresensorabnormalityO O Continuous for1 minute -High pressure sensoropen circuit duringcompressor stop High pressuresensor Lead wire andconnectorH97Outdoor fanmotormechanismlockO O O2 timeshappen within30 minutes- Outdoor fan motor lockor feedback Outdoor fanmotor lead wireand connector Fan motor lock orblockH98Indoor highpressureprotectionO O O - - Indoor high pressureprotection (Heating) Check indoorheat exchanger Air filter dirty Air circulationshort circuit