Gree GMV-615WM/G-X

Gree GMV6 DC Inverter VRF Units Service Manual
96
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 o nly one master
unit exists in the networ k. Afte r
redialing, power on the redialed
module s again
No
Properly connect the
commu nicatio n cable an d make
sure that it is in the same
network with o ther modules
The main control boa rd
may be ab normal
Yes
Replace the main control
board
Yes
Whether DIP switch is
dialed properly fo r the master unit (SA8)
among all the modules
in the network?
Whether th e
commu nicatio n cable s
for the modules of the master unit by
dialing are co nnecte d
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.
Troubleshooting: