Sinclair SDV 6 Service Manual page 67

8.1.6 A73 - The error of the linked FAPU is transmitted to the master IDU (non-series connection)
Note:
1) The type of FAPU may be HRV, VRF fresh air IDU and so on.
2) Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respective ly and
separately. A wired controller is used to set this installation method as a non-series connection.
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
64
Digital display
Master IDU: operates normally. FAPU: stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
The error of the linked FAPU is transmitted to the master IDU
Automatic recovery
 The FAPU is faulty.
The master IDU's main control board is damaged.

Obtain the linked error code (1)
of the FAPU, and refer to the
correspon ding error han dling
method in the maintena nce
manua l of the FAPU for
trouble sho otin g
Erro r in FAPU
Afte r troub leshooting, is the
master IDU error
code cl eared?
Note:
1. The error code can be queried after the FAPU is connected to the wired controller or the display
box.
Panel or display box
Spot check interface
A71/A73
No
Yes
Fault clear ed
Display position (master IDU)
Wired controller
Error code is not
query displayed
Replace th e the main co ntr ol
boa rd o f th e master IDU