Gree GMV6 DC Inverter VRF Units Service Manual
135
"HH" Over Voltage
Pro tection for the DC Bus
of Fan Drive
The fan dr ive boa rd is
abn ormal
Yes
Whether th e i nput voltage of the unit
exceeds 460V?
No
Replace th e fan drive board
Yes
Chang e the volta ge to
380V
2.89 "HL" Under Voltage Protection for DC Bus of Fan Drive
Fault display:
main board of outdoor unit displays
Fault diagnosis:
If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HL, it
indicates the under voltage protection for the DC bus of fan drive.
Possible causes:
■ The unit's input power cable has a voltage below 320 V;
■ The fan drive board operates improperly.
Troubleshooting:
"HL" Under Vol tage
Pro tection for the DC Bus
of Fan Drive
The fan dr ive boa rd is
abn ormal
Yes
Whether th e i nput voltage of the
unit fall s below 320V?
No
Replace th e fan drive board
Yes
Chang e the volta ge to
380V