Asami AMV6 - Page 137

Gree GMV6 DC Inverter VRF Units Service Manual
135
"HH" Over Voltage
Protection for the DC Bus
of Fan Drive
The fan drive board is
abnormal
Yes
Whether the input voltage of the unit
exceeds 460V?
No
Replace the fan drive board
Yes
Change the voltage 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 Voltage
Protection for the DC Bus
of Fan Drive
The fan drive board is
abnormal
Yes
Whether the input voltage of the
unit falls below 320V?
No
Replace the fan drive board
Yes
Change the voltage to
380V