Gree GMV-VQ680WM/C-X Service Manual page 119

Gree
Step 1: for the mode exchanger with several main boards, please check if error is reported for every main
board, if no, please make sure at least one branch is connected with IDU under the main board of every mode
exchanger;
Step 2: check the terminal between mode exchanger main board and IDU to see if it is loose or any foreign
objects inside? If yes, reconnect it after treatment;
Step 3: check if the communication cord between mode exchanger and IDU is damaged or short-connected,
if yes, please replace it;
Step 4: if the above inspections are normal, the detecting circuit might be abnormal, please replace the
mode exchanger main board and IDU main board in turn; then replace the main board after confirming the
faulted board.
2.43 "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:
Whether DIP switch is diale d
prop erly for th e master u nit (SA8)
2.44 "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.
"CF" Multi-master Units
Fault
among all the mo dules i n
the networ k?
Yes
The ma in con trol boa rd
may be ab normal
GMV6 HR DC Inverter VRF Units Service Manual
Make sure that o nly one maste r
No
unit exi sts in the networ k. Afte r
redi aling, power on the rediale d
Yes
Replace th e main control
boa rd
117
module s agai n