GREE Photovoltaic Direct-driven Inverter Multi VRF Units
149
CC No controlling unit
The SA8 dial switch of the ODU is
not switched to 00.
The SA8 dial switch of the ODU is
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.
CF
Multiple controlling
units
SA8 dial switches of multiple
ODUs are switched to 00.
Dial switches of multiple ODUs
1. Leave one SA8 dial switch unchanged, while
switch all the other dial switches to 11;
2. Replace the control board.
L7 No master IDU
The master IDU is powered off.
The communication of the master
IDU fails.
The main board of the master IDU
is faulty.
No master IDU is set in the
system.
Check if the master IDU is powered on. If yes,
replace the main board;
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.
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
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