GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4.5 “E6” Communication Error
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display E6
Error judgment condition and method:
If no communication between ODU and IDU or between IDU and wired controller in continuously 120s, this
error will be reported.
Possible reason:
■Communication wire is connected improperly or loose.
■Communication wire is cut off
■Communication wire is in poor connection
■Connected wired controller quantity or address setting is improper
■Controller is abnormal
Troubleshooting：
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