Midea V8 VRF Series - Page 70

V8 VRF Indoor Units
69
Troubleshooting Guide
6.1.22 C73 - Abnormal communication between the linked humidifying IDU and master IDU
Error display
Digital display
Display position (master IDU)
Panel or display box
Wired controller
Spot check interface
query
Error code is not
displayed
Error impact
Master IDU: operates normally. Humidifying IDUs: stop. Other IDUs of the same system: operate
normally.
ODU of the same system: operate normally.
Error trigger
If the main control board of the master IDU has lost communication with the main control board of
the humidifying IDU for 2 min
Error recovery
Automatic recovery
Possible cause
 The main control board of the humidifying IDU is damaged.
 The master IDU's main control board is damaged.
 Communication cables are loose or the communication port is faulty.
 Communication cables have short-circuited or been cut off.
Troubleshooting
C73
Cause 3: The main control board
of the master IDU is damaged
Cause 4: The main control board
of the humidifying IDU is
damaged
Cause 2: The communication
cable between the main control
board of the humidifying IDU and
the main control board of the
master IDU 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 master IDU
Replace the main control
board of the humidifying
IDU
Cause 1: The communication
cable between the main control
board of the humidifying IDU and
the main control board of master
IDU is disconnected or short
circuited
Replace the
communication cable and
properly connect the
cable
Note:
1. The error code can be queried after the humidifying IDU is connected to the wired controller or
the display box.