Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 113 / 240

Ultra Heat GMV VRF Technical Service Manual MAINTENANCE
108
3 seconds.
NOTE2: Press the
―ON/OFF‖ button on the interface of IDU project number and fault enquiry to
exist the parameter enquiry interface.
2 EXCEPTIONS ANALYZING AND TROUBLESHOOTING
2.1 Form Analyzing
Fault
code
Fault Possible reasons Solution
C0
Communication
failure between
indoor and ODUs
and IDU's
communicator
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.
If C0 is not displayed on the main 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 main 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 main 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 main board. If the fault is solved,
the main board is faulty. Replace the IDU. If the
fault is solved, the IDU is faulty.
C2
Communication
failure between main
control board and
inverter compressor
drive
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) Check if the cable connecting the main board
and the compressor's drive board is loose. If yes,
reconnect it;
2) Check if the cable connecting the main board
and compressor's drive board is broken. If yes,
replace the cable;
3) Check the contact of the communication cable
connecting the main board and compressor's drive
board;
4) Replace the main board. If the fault is solved,
the main board is faulty. Replace the compressor's
drive board. If the fault is solved, the compressor's
drive board is faulty.
C3
Communication
failure between main
control board and
variable frequency
fan drive
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) Check if the cable connecting the main board
and the fan's drive board is loose. If yes, reconnect
it;
2) Check if the cable connecting the fan's drive
board and main board is broken. If yes, replace the
cable;
3) Check the contact of the communication cable
connecting the fan's drive board and main board;
4) Replace the main board. If the fault is solved,
the main board is faulty. Replace the fan's drive
board. If the fault is solved, the fan's drive board is
faulty.
C5
Project number
conflict
1) Multiple IDUs share one project
number. 1) Reset the repeated project number (useful when
there is no centralized control of multiple systems).
C6
Outdoor unit number
inconsistency
warning
1) Communication cables between
ODUs are loose.
2) Communication cables between
ODUs are broken.
3) Communication cables between
1)If the communication cable is loose, reconnect it;
2) If the communication cable is broken, replace it;
3) Check contact of the communication cable;
4) Replace the main board.