Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 114 / 240

Ultra Heat GMV VRF Technical Service Manual MAINTENANCE
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ODUs are poorly connected.
4) The control board is faulty.
CC No master ODU
1) The S7 dial switch of the ODU is
not switched to 00.
2) The S7 dial switch of the ODU is
faulty.
1) Switch the S7 dial switch of an ODU to 00;
2) Replace the main board or switch an ODU's S7
dial switch to 00.
F0
Faults in the ODU's
main board (such as
memory and
address chip
exceptions)
1) The clock chip on the main
board is damaged.
2) The memory chip on the main
board is damaged.
3) The address chip on the main
board is damaged.
1) Replace the small CPU board;
2) Replace the main board.
L7 No master IDU
1) The master IDU is powered off.
2) The communication of the
master IDU fails.
3) The main board of the master
IDU is faulty.
4) No master IDU is set in the
system.
1) Check if the master IDU is powered on. If yes,
replace the main board;
2) Check the contact of the communication cable
of the master IDU. If no communication failure (C0)
is reported, replace the main board.
3) Replace the IDU's main board and reset the
master IDU.
4) Set the master IDU.
U3
Power phase
sequence protection
1) The three-phase power cable is
not connected correctly.
2) The main board's detection
circuit is faulty.
1) Check connection of the power cable.
2) Replace the main board.
P3
Compressor drive
module reset
protection
1) The compressor drive board is
faulty.
1) Replace the compressor drive board.
P5
Inverter compressor
over-current
protection
1) The drive board's IPM module 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.
P6
Compressor drive
IPM module
protection
1) The drive board's IPM module 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.
P7
Compressor drive
temperature sensor
fault
1) The compressor drive board is
faulty.
1) Replace the compressor drive board.
P8
Compressor drive
IPM
over-temperature
protection
1) The compressor 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 compressor drive board;
2) Apply thermal gel evenly on the IPM module;
3) Screw the IPM module properly.
P9
Inverter compressor
out-of-step
protection
1) The compressor drive board is
faulty.
2) The compressor is damaged.
1) Replace the compressor drive board.
2) Replace the compressor.
PH
Compressor drive
DC bus high voltage
protection
1) Does the voltage of the input
power cable of the whole system
exceed 800 V;
2) The compressor drive board is
faulty.
1) Lower the voltage of the input power cable to
the 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.