Mini UM S/M Troubleshooting by Indication on the Remote ControllerTroubleshooting 1594.46 “UH” Malfunction of System, Refrigerant System AddressUndefinedRemoteControllerDisplayUHApplicableModelsAII indoor unit modelsAII outdoor unit modelsMethod ofMalfunctionDetectionMalfunctionDecisionConditionsSupposedCauses Improper connection of transmission wiring between outdoor unit and outdoor unit outsidecontrol adaptor Defect of indoor unit PC board Defect of outdoor unit PC board (A1P)TroubleshootingCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.(V2831)NOYESYESAfter fixing incorrect wiring,push and hold the RESETbutton on the master outdoorunit PC board for 5 seconds.NormalNOIselectricitybeing introduce forthe first time afterinstallationor after an indooror outdoor unit PCboard has beenreplaced?Isindoor - outdoor andoutdoor - outdoor unittransmission wiringnormal?YESNormalNODoes a malfunction occur?NODoesa "UH" malfunction occurfor all indoor units inthe system?YES NODoesa malfunctionoccur even after 12minutes elapses from thetime when electricity isintroduced to indoorand outdoorunits?YESReplace indoor unit PC board.Replace outdoor unit PCboard (A1P).After fixing incorrect wiring,push and hold the RESETbutton on the outdoor unitPC board for 5 seconds∗ The unit will not run for up to12 minutes.
