Gree GMV5E Series Service Manual page 168

GREE
Error judgment condition and method:
When multiple refrigerant system is connected through CAN2 network of unit mainboard, it is
allowable to have only one master system in this network.
When the system address DIP switch (SA2) of master controlling unit in two or more systems are
detected as the master system DIP switch simultaneously, that is SA2 DIP switch is "00000", it will report
multiple master systems error.
Possible reason：
■When the system address DIP switch (SA2) of master controlling unit in two or more systems are
set as the master system DIP switch, the SA2 DIP switch of master controlling unit in only one system
shall keep as "00000". The SA2 DIP switch of master controlling unit in other systems shall be set in
different codes.
■DIP switch is abnormal or mainboard is abnormal.
Troubleshooting:
2.2.4.41 "CP" Multiple master wired controller error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
There are two or more wired controllers in one HBS network are set as the master wired controller.
Possible reason：
When two (or more) wired controllers control one or several IDUs simultaneously, the two (or more)
wired controller are master wired controller.
Troubleshooting:
Make sure there are two wired controllers in maximum to control one or several IDUs; when two
wired controllers control one or several IDUs, enter wired controller parameter setting (P13) to set the
address of one wired controller as 02, that is slave wired controller.
2.2.4.42 "Cb" IP address allocation overflow
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
164