Midea
V8
Series VRF Indoor Units
6.1.7 A74 - The error of the AHU Kit slave unit is sent to the master unit
Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the
ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box. When the slave fails, the slave
sends a fault signal to the master, and the master displays the slave fault "A74".
Display position (master)
Display box and wired controller
Master unit and slave unit: stop. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
The error of the slave unit is sent to the master unit
The slave unit is faulty.
The master unit's main control board is damaged.
A74
Error
in slave unit
After troubleshooting, is the
master unit error code
cleared?
Replace the the main control
board of the master IDU
Fault cleared
Yes
No
Check the running status of
the slave unit, confirm and
resolve the error (1)
Note:
1. The error code can be queried after the slave is connected to the display box (during field
service, the display box can be temporarily removed from the master unit and connected to the
slave unit)
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