Part 2 Exception And Troubleshooting - Gree GMV5 Series Service Manual

Part 2 Exception and Troubleshooting

Exception Analyzing and Troubleshooting
(1) Form analyzing
1. Control
Fault
Fault
code
Faults in the ODU's
main board (such as
F0 memory and
address chip
exceptions)
Faults in the
constant frequency
FC
compressor's
current sensor
Wrong outdoor
U2 capacity code
setting
Power phase
U3
sequence protection
Wrong emergency
UL
operation dial code
Communication
failure between
C0 indoor and ODUs
and IDU's
communicator
Communication
failure between
C2 main control board
and inverter
compressor drive
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Possible reasons
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. The constant-frequency
compressor is not started.
2. The current detection board is
faulty.
3. The main board's detection
circuit is faulty.
1. The capacity code is wrong.
2. The dial component is faulty.
1. The three-phase power cable is
not connected correctly.
2. The main board's detection
circuit is faulty.
1. The dial setting is wrong.
2. The dial component is faulty.
1. The communication cable is not
connected.
2. The communicator is
disconnected.
3. The communication cable is
poorly connected.
4. The communicator controller is
faulty.
1. The communication cable is not
connected.
2. The communicator is
disconnected.
3. The communication cable is
poorly connected.
4. The communicator is faulty.
1. Replace the small CPU board.
2. Replace the control board.
3. Replace the control board.
1. If the compressor is not started, check if the AC
contact is closed. If not, replace the AC contact.
If the connection is loose, reconnect it;
2. Replace the current detection board.
3. Replace the main board.
1. Modify the capacity code setting.
2. Replace the main board.
1. Check connection of the power cable.
2. Replace the control board.
1. Modify the dial setting.
2. Replace the main board.
If C0 is not displayed on the control board of the
ODU, check the network between the IDU and
communicator. If C0 is displayed, check the network
between the IDUs and ODUs and between the IDU
and communicator as follows:
1) Check if the cables connecting the control board of
the ODU and the IDU and connecting the IDU and
communicator are loose. If yes, reconnect them;
2) Check if the cables connecting the control board
and IDU and connecting the IDU and
communicator are broken. If yes, replace the
cables;
3) Check the contact of the communication cables;
4) Replace the control board. If the fault is solved, the
control board is faulty. Replace the IDU. If the fault
is solved, the IDU is faulty.
1) Check if the cable connecting the control board
and the compressor's drive board is loose. If yes,
reconnect it;
2) Check if the cable connecting the control board
and compressor's drive board is broken. If yes,
replace the cable;
3) Check the contact of the communication cable
connecting the control board and compressor's
drive board;
4) Replace the control board. If the fault is solved, the
control board is faulty. Replace the compressor's
drive board. If the fault is solved, the compressor's
drive board is faulty.
129
Solution