Gree GMV6 DC Inverter VRF Units Service Manual
■ The main board operates improperly.
Troubleshooting:
No
Yes
"C2" Com munication Fault
Be twee n t he Prima ry Co ntroller
an d Inve rt er Compresso r Dr iver
Whet he r t he communica tion
cab les betwe en the main bo ard o f o utd oo r
un it a nd in verte r compresso r drive b oard
are conne cted prop erly?
Con ne ct th e co mmu nicatio n
cables properly
No
Rep lace the compre ssor drive
bo ard
The main cont ro l bo ard ma y be
abnormal
Yes
Rep lace the m ain co nt rol bo ar d
Whet he r t he ou tdo or u nit's
com p re ssor dr ive boa r d is n or mal?
Yes
2.29 "C3" Communication Fault Between the Primary Controller
and Inverter Fan Driver
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the outdoor unit fails to detect inverter fan driver for 30 consecutive seconds, the fault is
generated.
Possible causes:
■ The communication cables between the main board of outdoor unit and inverter fan driver inside
the module are connected improperly;
■ The inverter fan driver operates improperly;
■ The main board operates improperly.
Troubleshooting:
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