Gree Ultra Heat GMV-VQ72W/A-F, Service Manual

Page: 130 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial MAINTENANCE
126
DC bus high voltage
protection
power cable of the whole system
exceed 800 V;
2) The compressor drive board is
faulty. required range;
2) Replace the compressor drive board.
PL
Compressor drive
DC bus low voltage
protection
1) Is the voltage of the input power
cable of the whole system lower
than 100 V;
2) The compressor drive board is
faulty.
1) Elevate the voltage of the input power cable to
the required range;
2) Replace the compressor drive board.
PC
Compressor drive
current check circuit
fault
1) The compressor drive board is
faulty.
1) Replace the compressor drive board.
PF
Compressor drive
recharging circuit
fault
1) Is the voltage of the input power
cable of the whole system lower
than 60 V;
2) The compressor drive board is
faulty.
1) Elevate the voltage of the input power cable to
the required range;
2) Replace the compressor drive board.
PJ
Inverter compressor
starting failure
1) The drive board is damaged;
2) The compressor's UVW cable is
not connected properly;
3) The compressor is damaged.
1) Replace the compressor drive board;
2) Reconnect the compressor's UVW cable;
3) Replace the compressor.
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.
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.
NOTE: C5 fault means IDUs project numbers conflict with each other, which may happens in a
cooling system or in different cooling systems controlled in a centralized way. Solution of C5 fault has
two ways, one way is changing conflicting project numbers by wired controller according to owner
‘s