GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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Troubleshooting:
2.2.4.39 “CF” Multiple master controlling units error
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Mainboard detects the DIP switch (SA8) of master controlling unit to judge if it is master controlling
unit. When multiple master controlling units are detected in the communication network of multiple
modules system, it will report this error.
Possible reason：
■DIP switch of master controlling unit is abnormal; there are multiple master controlling units in the
network
■Detecting circuit is abnormal
Troubleshooting:
2.2.4.40 “CJ” System address code conflict
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
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