Sinclair SDV 6 Service Manual page 87

8.1.19 C61 - Abnormal communication between the IDU main control board and display control board
Note: The error code C61 can be triggered either at the IDU side or at the panel or display box side.
Error display
The faulty IDU and other IDUs of the same system: operate normally.
Error impact
ODU of the same system: operate normally.
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Error trigger
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Error recovery
Automatic recovery
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Possible cause
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84
Digital display
Triggered at the IDU side: If the main control board of the IDU has been connected to the display
board but has not communicated with the display board for 2 min;
Triggered at panel or display box side: If the display board has not received any reply from the main
control board of an IDU for 1 min
Unplug the display box or panel communication wire from the main control board of powered indoor
unit.
Use a wrong port to connect display control board and IDU main control board.
The communication wire between the display control board and the IDU main control board has
become loose.
Short circuit or open circuit in communication wire
The display box or panel does not match the indoor unit model.
The display control board is damaged.
The IDU main control board is damaged.
Display position
Triggered at the IDU side
Panel, display box, and
wired controller
Triggered at the panel or
display box side
Panel, display box, and
wired controller