Sinclair SDV 6 Service Manual page 84

8.1.17 C41 - Abnormal communication between IDU main control board and fan drive board
Error display
The faulty IDU stops. Other IDUs of the same system: operate normally.
Error impact
ODU of the same system: operate normally.
Error trigger
If the main control board of an IDU has lost communication with the fan drive board for 2 min (3)
Error recovery
Automatic recovery
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Possible cause
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Troubleshooting
Note:
1. Communication cables are only provided for units whose fan drive board is independent of the IDU main
control board.
2. For units whose fan drive board is welded onto the main control board, if either the fan drive board or
main control board becomes faulty, the whole control board has to be replaced.
Digital display
The fan drive board is damaged.
The IDU main control board is damaged.
The communication cable between the fan drive board and the IDU main control board has become
loose.
C41
Panel, display box, and wired controller
Cause 1: The communication
cable between the fan drive
board and the IDU main control
board has become loose (1)
Cause 2: The IDU main control
board is damaged
Cause 3: The fan drive board is
damaged (2)
Display position
Reconnect the
loose plug
Replace the main
control board of the
IDU
Replace the fan
drive board
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