GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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Error judgment condition and 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.
2.2.4.136 “U8” IDU 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 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;
Troubleshooting:
2.2.4.137 “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
parameter is abnormal, it will indicate this error.
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