Gree GMV5 Series, Service Manual

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GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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Error judgment condition a nd method:
During commissioning, check if ODU cut-off valve is opened through detecting system parameter by
pressure sensor. If the parameter is abnormal, it will indicate that confirming the open of cut-off valve and
then press SW5 to enter the next step after confirming.
Possible reason
：
■ODU cut -off valve is not opened;
Troubleshooting:
Confirm again and open ODU cut-off valve.
2.3.4.136 “U8” IDU pipeline error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment cond ition and method:
During commissioning, check if IDU pipeline is blocked through detecting IDU pipeline. If the
parameter is abnormal, it will indicate t
Possible reason
：
■Electronic expansion valve doesn’t operate normally;
■IDU pipeline is blocked;
Troub leshooting:
2.3.4.137 “U9” ODU pipeline error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
During commissioning, check if ODU pipeline is blocked through detecting system pressure. If the