6.1.24 C75 - Communication fault between linked FAPU and master IDU (non-series setting)
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 respectively and
separately. A wired controller is used to set this installation method as a non-series connection.
Display position (master IDU)
Spot check interface
query
Error code is not
displayed
Master IDU: operates normally. FAPU: stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
If the main control board of the master IDU has lost communication with the main control board of
the FAPU for 2 min
The main control board of the FAPU 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.
C74/C75
Cause 3: The main control board
of the master IDU is damaged
Cause 4: The main control board
of the FAPU is damaged
Cause 2: The communication
cable between the main control
board of the FAPU 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 FAPU
Cause 1: The communication
cable between the main control
board of the FAPU and the main
control board of the 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 FAPU is connected to the wired controller or the display
box.
To Next Page
Loading...
Need help?
General
