GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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2.2.4.3 “A3” Defrosting status
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This code is status code, which means the system has entered into defrosting status, the operating
IDU fan will stop for 5-10 minutes.
Possible reason：——
Troubleshooting:
status code, no troubleshooting.
2.2.4.4 “A4” Oil return status
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This code is status code, which means the system has entered into oil return status, if returning oil
under heating mode, the operating IDU will stop for 5-10 minutes.
Possible reason：——
Troubleshooting:
status code, no troubleshooting.
2.2.4.5 “A6” Cooling and heating function setting status
Error display:
ODU mainboard
will display
Error judgment condition and method:
This code is status code, which means the system has entered into cooling and heating function
setting status. At this time, cooling & heating mode (nA), cooling only mode (nC), heating only mode (nH)
and supply air mode (nF) are selectable.
Possible reason：——
Troubleshooting:
status code, no troubleshooting.
2.2.4.6 “A7” Quiet mode setting status
Error display:
ODU mainboard
will display
Error judgment condition and method:
This code is status code, which means the system has entered into quiet mode setting status.
Possible reason：——
Troubleshooting:
status code, no troubleshooting.
2.2.4.7 “A8” Vacuum mode
Error display:
ODU mainboard
will display
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