Gree GMV-VQ680WM/C-X Service Manual page 118

Gree
Re-engineer the unit to increase indoor unit capacity or decrease outdoor unit capacity.
2.41 "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:
"CC" No Master Un its Fau lt
dial ed properl y fo r the master unit (SA8)
for the module s of the master unit by
2.42 "CE" Mode exchanger and IDU communication error
Error display: mode exchanger main board will display
Applicable model: all mode exchangers
Error judgment condition and method:
For the mode exchanger, no IDU communication is detected in 1 consecutive minute.
Possible reasons:
■Poor contact between mode exchanger main control board and IDU main control board terminal
■Communication cord is abnormal
■Circuit is abnormal
Troubleshooting:
Whether DIP switch is
among all the mo dules
in th e n etwork?
Yes
Whether th e
commu nicatio n cable s
dial ing are co nnecte d
prop erly ?
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
No
commu nicatio n cable an d make
sure th at it is in the same
network with o the r modu les
Yes
Replace th e main control
boa rd
116
module s agai n
Pro perly conn ect the