Gree GMVVQ1015WM/C-X, Service Manual

Page: 118 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
116
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:
No
Yes
"CC" No Master Un its Fau lt
Make sure that o nly one maste r
unit exi sts in the networ k. Afte r
redi aling, power on the rediale d
module s agai n
No
Pro perly conn ect the
commu nicatio n cable an d make
sure th at it is in the same
network with o the r modu les
The ma in con trol boa rd
may be ab normal
Yes
Replace th e main control
boa rd
Yes
Whether DIP switch is
dial ed properl y fo r the master unit (SA8)
among all the mo dules
in th e n etwork?
Whether th e
commu nicatio n cable s
for the module s of the master unit by
dial ing are co nnecte d
prop erly ?
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: