GREE U-Match 6 SERIES UNIT SERVICE MANUAL
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3.4.11 “CJ” IDU Jumper Cap Error
Error display:
IDU wired controller and IDU receiver light board will display CJ
Error judgment condition and method:
If jumper cap model doesn’t match with mainboard, this error will be reported.
Possible reason:
■Jumper cap is not installed.
■Jumper cap model is wrong.
■Detecting circuit is abnormal.
Troubleshooting:
3.4.12 “H4” Overload
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display H4
Error judgment condition and method:
When tube temperature is higher than the protection value, system will report overload protection.
Possible reason:
■Cooling ODU heat exchanger is blocked or heat exchange is bad.
■Heating IDU heat exchanger is blocked or heat exchange is bad.
■Operating temperature is too high.
■System charging quantity is too much.
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