Sinclair SDV 6 Service Manual page 78

8.1.15 C11 - Duplicate IDU address code
Error display
Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: The fan
continues running, the EEV is closed, and error code "A51" is displayed (SDV5 plat. IDU displays the code
"Ed"). Meaning of the code: ODU fault
Error impact
ODU of the same system:


Error trigger
Repeated address codes for IDU
Error recovery
Automatic recovery

Possible cause

Troubleshooting
(▲): The common reasons for address code duplication are as follows:
1. After replacing the main control board, the address was not reset, resulting in address duplic ation. The
address can be manually set using the controller or the indoor unit address can be cleared at the outdoor unit
and then automatically addressed again.
2. In systems where the nominal capacity of an indoor unit is greater than or equal to 20KW, the indoor unit
usually occupies more than two addresses (one real address + several virtual addresses, see Note 1 below),
which may cause the addresses of other indoor units in the system to duplicate with the virtual addresses of the
large indoor unit. In this case, the indoor unit address can be cleared at the outdoor unit and then automatically
addressed again, or the controller can be used to manually set the address to avoid duplicate codes when the
duplicate address code is known.
Digital display
Stop.
Error code "C26" is displayed (SDV5 plat. ODU displays the code "H7"). Meaning of the code: IDU qty
decrease fault
Duplicate IDU address code (▲)
The IDU main control board is damaged.
IDU that reports
repeated addresses.
Is the address
Replace the main control
board of the IDU (the
communication circuit of the
main control board is
Error code and address
C11
Locate the
Yes
repeated?
No
damaged)
Display position
Panel or display box
code are displayed
alternately (2)
Reset the address (1)
Wired controller
Error code and address
code flash simultaneously
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