Troubleshooting Si04-402A84 Service Diagnosis4.10 Outdoor Unit PCB AbnormalityRemoteControllerDisplayE1Method ofMalfunctionDetection The proper programme operation of the microcomputer is checked by the programme. Checking whether the EEPROM data have the information of the outdoor unitMalfunctionDecisionConditions When the microcomputer programme does not function properly When the information of the outdoor unit (the type of the electronic expansion valve) isunidentified in the EEPROM dataSupposedCauses Microcomputer programme run-away due to an external factor.∗Noise∗Momentary voltage drop∗Momentary power failure, etc. Unidentified information of the outdoor unit∗Damage of the EEPROM Faulty outdoor unit PCB.TroubleshootingTurn on the power again.Check the grounding.YESYESReplace the outdoor unitPCB.The electronic expansionvalve is unidentified.Replace the outdoor unitPCB.Provide proper grounding.The malfunction may becaused by an externalfactor, rather than defectiveparts.Locate the cause of thenoise, etc., and correct thesituation.Doesthe LEDAturn on a lightagain?NONO(R4000)Is the groundingproper?YESDoesthe LEDAswitch the light off afterblinking about 30seconds?NOCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.
