Gree GMV6 DC Inverter VRF Units Service Manual
Re-engineer the unit to increase indoor unit capacity or decrease outdoor unit capacity.
2.38 "CC" No Master Units Fault
Fault display:
main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The main board detects the master DIP switch (SA8) and determines whether it is the master.
When no master unit is detected in the multi-module communication network, the fault is generated.
Possible causes:
■ The master DIP switch is abnormal and no master unit exists in the network;
■ The communication cables are abnormal, causing the master unit to be disconnected;
■ Abnormal detection circuit.
Troubleshooting:
No
Yes
"CC" No Master Units Fault
Make sure that only one master
unit exists in the network. After
redialing, power on the redialed
modules again
No
Properly connect the
communication cable and make
sure that it is in the same
network with other modules
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?
Whether the
communication cables
for the modules of the master unit by
dialing are connected
properly ?
2.39 "CF" Multi-master Units Fault
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The main board detects the master DIP switch (SA8) and determines whether it is the master.
When multiple master units are detected in the multi-module communication network, the fault is
generated.
Possible causes:
■ The master DIP switch is abnormal and multiple master units exist in the network;
■ Abnormal detection circuit.
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