GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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Fault
code
Fault
Possible reasons
Solution
IDU fails.
The main board of the master IDU
is faulty.
No master IDU is set in the
system.
Check the contact of the communication cable of
the master IDU. If no communication failure (C0) is
reported, replace the main board.
Replace the IDU's main board and reset the
master IDU.
Set the master IDU.
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
modes or be turned on or off. The whole device cannot be started before the conflict is solved. The
commissioning
software will show the following page:
Figure 1
