GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
233
Possible reason
：
■Electronic expansion valve doesn’t operate normally;
■ODU pipeline is blocked;
Troubleshooting:
2.2.4.138
“UC” Setting of master IDU is done
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This code is status code, not an error. During commissioning, it indicates that setting of master IDU
is done.
Possible reason
：——
Troubleshooting:
——
2.2.4.139
“UL” Compressor emergency operation DIP switch error
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
If setting of compressor emergency operation DIP switch is not within the setting range, it will
indicate this error.
Possible reason
：——
Troubleshooting:
Reset the DIP switch according to relevant sheet.
