Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
165
connected properly;
3. The compressor is damaged.
2. Reconnect the compressor's UVW
cable;
3. Replace the compressor.
C3
Communication failure
between main control
board and variable
frequency fan drive
1. The control board is powered off;
2. The fan drive board is powered off;
3. The communication cable between the
control board and fan drive board is not
connected;
4. The fan drive board's dial switch is
wrong.
1. Check the power supply of the
control board. Replace the control
board if it works properly;
2. Check the power supply of the
drive board. Replace the drive board
if it works properly;
3. Connect the main board and drive
board using the communication
cable;
4. Adjust the dial switch of the fan
drive board.
H3
Fan drive module reset
protection
1. The fan drive board is faulty.
1. Replace the fan drive board.
H5
Variable frequency fan
over-current protection
1. The fan drive board's IPM module is
damaged;
2. The fan's UVW cable is not connected
properly;
3. The fan is damaged.
1. Replace the fan drive board;
2. Reconnect the fan's UVW cable;
3. Replace the fan.
H6
Fan drive IPM module
protection
1. The fan drive board's IPM module is
damaged;
2. The fan's UVW cable is not connected
properly;
3. The fan is damaged.
1. Replace the fan drive board;
2. Reconnect the fan's UVW cable;
3. Replace the fan.
H7
Fan drive temperature
sensor fault
1. The fan drive board is faulty.
1. Replace the fan drive board.
H8
Fan drive IPM
over-temperature
protection
1. The fan drive board is faulty;
2. Thermal gel is not applied evenly on the
IPM module;
3. The IPM module is not screwed properly.
1. Replace the fan drive board;
2. Apply thermal gel evenly on the
IPM module;
3. Screw the IPM module properly.
H9
Variable frequency fan
out-of-step protection
1. The fan drive board is faulty.
2. The fan is damaged.
1. Replace the fan drive board.
2. Replace the fan.
HH
Fan drive DC bus high
voltage protection
1. Does the voltage of the input power
cable of the whole system exceed 410 V;
2. The fan drive board is faulty.
1. Lower the voltage of the input
power cable to the required range;
2. Replace the fan drive board.
HL
Fan drive DC bus low
voltage protection
1. Is the voltage of the input power cable of
the whole system lower than 205 V;
2. Is the fan drive board well connected with
the compressor drive board;
3. The fan drive board is faulty.
1. Elevate the voltage of the input
power cable to the required range;
2. Connect the fan drive board with
the compressor drive board
according to the wiring diagram;
3. Replace the fan drive board.
HC
Fan drive current
detection circuit fault
1. The fan drive board is faulty.
1. Replace the fan drive board.
HJ
Variable frequency fan
starting failure
1. The drive board is damaged;
2. The fan's UVW cable is not connected
properly;
3. The fan is damaged.
1. Replace the fan drive board;
2. Reconnect the fan's UVW cable;
3. Replace the fan.