Gree GMV6 DC Inverter VRF Units Service Manual
■ Inverter fan over-current protection (2-digit digital LED of the main control board of the outdoor unit
displays H5);
■ Communication fault of fan drive (2-digit digital LED of the main control board of the outdoor unit
displays C3).
Troubleshooting:
Step 1:
Check the fault code displayed on the wired controller of the indoor unit.
Step 2:
Check the fault code displayed on the 2-digit digital LED of the outdoor unit at the same time.
Step 3:
Troubleshoot according to the fault code displayed on the 2-digit digital LED of the outdoor
unit (troubleshooting procedures may vary depending on the fault).
2.80 "H2" Power Voltage Protection for the Fan Drive Board
Fault display: wired controller of indoor unit displays
Fault diagnosis:
Check the fault code displayed on the wired controller of the indoor unit. If the wired controller
displays H2, check the fault code displayed on the 2-digit digital LED of the main control board of the
outdoor unit, based on which you are able to identify the specific fault of the fan drive board. Then,
troubleshoot the fault according to the corresponding troubleshooting methods.
Possible causes:
■ Over voltage protection for the DC bus of fan drive (2-digit digital LED of the main control board of
the outdoor unit displays HH);
■ Under voltage protection for the DC bus of fan drive (2-digit digital LED of the main control board
of the outdoor unit displays HL).
Troubleshooting:
Step 1:
Check the fault code displayed on the wired controller of the indoor unit.
Step 2:
Check the fault code displayed on the 2-digit digital LED of the outdoor unit at the same time.
Step 3:
Troubleshoot according to the fault code displayed on the 2-digit digital LED of the outdoor
unit (troubleshooting procedures may vary depending on the fault).
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