Midea V8 VRF Series - Page 75

V8 VRF Indoor Units
74
Midea
V8
Series VRF Indoor Units
6.1.27 C79 - Abnormal communication between the IDU main control board and adapter board
Error display
Digital display
Display position
Panel, display box, and wired controller
Error impact
Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: operate
normally.
ODU of the same system: operate normally.
Error trigger
If the main control board of an IDU has lost communication with the adapter board for 2 min
Error recovery
Automatic recovery
Possible cause
See the Troubleshooting section.
Troubleshooting
C79
Cause 3: The IDU main control
board is damaged
Cause 4: The adapter board is
damaged
Cause 2: The communication
cable between the main control
board of the IDU and the adapter
board has become loose or is
connected to a wrong port
Properly connect the
cables and ensure
they are connected to
the right ports
Replace the main
control board of the
IDU
Replace the adapter
board
Cause 1: The communication
cable between the main control
board of the IDU and the adapter
board has become disconnected
or short circuited
Replace the
communication cable
and properly connect
the cable