SiBE811001EB TroubleshootingCONVENI-PACK 2848.5.24 System Abnormality and Refrigerant System Address UndefinedError Code UHApplicableModelsAll indoor modelsLCBKQ3AV1Method of ErrorDetectionDetect an indoor unit with no address setting.Error DecisionConditionsThe error decision is made as soon as the abnormality aforementioned is detected.SupposedCauses Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units Defective indoor unit PCB Defective booster unit PCBTroubleshooting∗1. Check the correct wiring “indoor-outdoor” and “outdoor-outdoor” by Installation manual.LED IndicationsFirst digit l h k l h h lSecond digit l k h l h l lNOYESYESYES NormalNONO After fixing the incorrect wiring,press and hold the RESETbutton on the master outdoorunit PCB for 5 seconds.∗ The unit will not run for up to12 minutes.NO NormalNO Replace the booster unit PCB.Replace the outdoor unit PCB.YESYESCaution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.Is electricity being introducefor the first time afterinstallation or after anbooster or outdoor unit PCBhas been replaced?Does an error occur evenafter 12 minutes elapsesfrom the time whenelectricity is introduced tobooster and outdoorunits?Is indoor - outdoor andoutdoor - outdoor unittransmission wiringnormal? ∗1Does a “UH” erroroccur for all indoorunits in the system?Does an error reoccur?Press and hold the RESET button onthe outdoor unit PCB for 5 seconds.
