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V8 VRF Indoor Units
6.1.21 C72 - Number of AHU Kits is not the same as the set number
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.
Error display
Master unit and slave unit: stop. Other IDUs of the same system: stops.
ODU of the same system:
Error impact
When it is detected that the number of AHU Kits in operation is different from the set number and
Error trigger
this lasts for 3 min
Error recovery
Automatic recovery
Possible cause
Troubleshooting
Note: 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)
68
Digital display
stops.
Error code "C26" is displayed (V6 platform ODU displays the code "H7"). Meaning of the
code: IDU qty decrease fault
The master unit's or slave unit's main control board is damaged.
The actual number of AHU Kits is different from the set number.
Communication between the master unit and slave unit fails.
C72
Display box or wired controller
Cause 1: The actual number
of AHU Kits is different from
the set number
Cause 2: The master unit's
or slave unit's main control
board is damaged
Cause 3: Communication
between master unit and
slave unit has failed
Display position (master)
Set the number of AHU
Kits based on the actual
situation
Replace the damaged
main control board
Check the communication
cables and take measures
according to
troubleshooting process for
the error code "C71"
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