GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
158
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 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.
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 fan's drive
board and the compressor's drive board is
loose. If yes, reconnect it;
2) Check if the cable connecting the fan's drive
board and compressor's drive board is broken.
If yes, replace the cable;
3) Check the contact of the communication cable
connecting the fan's drive board and
compressor's drive board;
4) Replace the control board. If the fault is solved,
the control board is faulty. Replace the fan's
drive board. If the fault is solved, the fan's drive
board is faulty.
Indoor unit project
number conflict
warning
1) Project numbers conflict with
each other.
1) Change conflicting project numbers and
ensure that no IDU's project number is
repeated.
Outdoor unit
number
inconsistency
warning
1) Communication cables
between ODUs are loose.
2) Communication cables
between ODUs are broken.
3) Communication cables
between ODUs are poorly
connected.
4) The control board is faulty.
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 control board.
1) The SA8 dial switch of the
ODU is not switched to 00.
2) The SA8 dial switch of the
ODU is faulty.
1) Switch the SA8 dial switch of an ODU to 00;
2) Replace the control board or switch an ODU's
SA8 dial switch to 00.
Multiple
controlling units
1) SA8 dial switches of multiple
ODUs are switched to 00.
2) Dial switches of multiple ODUs
are faulty.
1) Leave one SA8 dial switch unchanged, while
switch all the other dial switches to 11;
2) Replace the control board.
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.
1) Multiple IDUs share one
project number.
1) Reset the repeated project number (useful
when there is no centralized control of multiple
systems).
NOTE:
Solution of C5 fault when multiple cooling systems are controlled in a centralized way.
When multiple cooling systems are controlled in a centralized way, the C5 fault, i.e. project number
conflict, may occur on different cooling systems. In such case, set project numbers of each system and
solve the fault as follows:
(1) Project number conflict:
When multiple systems are controlled in a centralized way, if two or more IDUs share the same
project number, the engineer number conflict occurs. In that case, IDUs cannot be switched to varied
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