Electrolux W455 H Service Manual page 30

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Fault code 23, NO I/O ADDRESS.
The fault code means that there is no I/O board addressed in the system at
all.
Action:
• (Requires password) Readdress the existing I/O board from the service
menu.
Fault code 24, CHECKSUM FROM DLCU
This fault code is generated by the programming CPU board. The program
unit has detected a fault in the internal communication on the CPU board.
Action:
• Replace the CPU board.
Fault code 27, LEVEL OFFSET
This fault code is generated by the programming CPU board. The fault code
arises if the level system indicates a level at the start of the wash program
(when the drum should be empty) that exceeds what the program unit can
compensate for automatically. This can be caused by blocked drain, blocked
level hose, a drop of water in the level hose, leaking level system, defective
level control, etc.
Action:
• Check drain for dirt.
• Blow through the level hose and check that it is not blocked and does not
contain any water.
• Check in the service program that the level control is working correctly.
438 9047-81/02
Troubleshooting