Gree GMV6 DC Inverter VRF Units Service Manual
Troubleshooting:
No
"CF" Multi-master Units
Fault
Make sure that only one master
unit exists in the network. After
redialing, power on the redialed
modules again
The main control board
may be abnormal
Yes
Replace the main control
board
Yes
Whether DIP switch is dialed
properly for the master unit (SA8)
among all the modules in
the network?
2.40 "CJ" System Address Code Conflict
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When multiple refrigerant systems are connected through the CAN2 network of the unit's main
board, only one primary system is allowed in the network.
If two or more master units' DIP switches (SA2) are detected to be master unit's DIP switches in the
network (that is, SA2 DIP switch is "00000"), the fault of multiple master units is reported.
Possible causes:
■ If two or more master units' DIP switches (SA2) are detected to be master unit's DIP switches,
keep only one master unit's DIP switch (SA2) to be "00000" and other master units' DIP switches (SA2)
to be different;
■ Abnormal DIP switch or main board.
Troubleshooting:
Yes
"CJ" System Address Code
Conflict
Keep the SA2 DIP switch to be
"00000" for only one master unit, and
set that for other master units to be
different. After redialing, power on the
redialed units again
The detection circuit may
operate improperly
Yes
Replace the main control
board
No
Whether two or more master units'
DIP switches (SA2) are set to the master
unit's DIP switches?
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