Electrolux Washer Extractor Error Code 24: Checksum From DLCU
Error code 24 means the CPU board detected an error in internal communication with the DLCU processor. The manual's action is to replace the CPU board.
High: an internal link error stops the control from running the drum and door lock safely.
- Code
- Error code 24
- Equipment
- Industrial laundry
- Applies to
- Electrolux washer-extractors W465H-W4300H, W475S-W4330S, W475N-W4330N (Type W3..., Compass Control)
What does Electrolux Professional error code 24 mean?
The CPU board and the DLCU, the processor that handles the door lock and drum command, exchange data all the time. Each message carries a checksum, a small number worked out from the data, so the receiver can tell whether it arrived intact. If the CPU board gets a message from the DLCU whose checksum does not match, it shows ERROR 024 / CHECKSUM FROM DLCU. The manual treats it as a communication error inside the control and gives one remedy, which is to replace the CPU board. It lists no external causes. Because the DLCU is part of the same control assembly, the board is the first and only suspect. Operators see the machine stop, and it may start again after a restart if the error was a one-time glitch. A repeat means the internal link is damaged and the board needs to go.
Affected models and control systems
Electrolux washer-extractors W465H-W4300H, W475S-W4330S and W475N-W4330N, Type W3..., with the Compass Control. The code is about the internal link between the CPU board and the DLCU processor.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Display shows ERROR 024 / CHECKSUM FROM DLCU
- Machine stops during or before a program
- Message may clear after a restart
- Message returns after a few cycles
Possible causes
Likely causes — what usually sits behind error code 24 on this control. A technician confirms which one it is before any part is replaced.
- Electrical noise corrupting the internal link
- Board damaged by a power surge
- Connector between the CPU board and DLCU loose
Safe checks before calling for service
- Switch the machine off for a minute and on again.
- Note when the message appeared and what else was running nearby.
- Do not open the control cabinet.
- Write down the code and call us.
How a technician diagnoses error code 24
- Read the code and confirm ERROR 024.
- Check for recent power events.
- Check the connection between the CPU board and DLCU.
- Replace the CPU board if the error returns.
- Load the machine's settings into the new board.
- The CPU board sits behind covers on a machine with line voltage.
- A replacement board must be set up with the machine's own data.
- Intermittent link errors need a technician to decide whether it is the board or noise.
How error code 24 differs from similar codes
Code 24 is the CPU board seeing a bad message from the DLCU; code 51 is the DLCU seeing a bad message from the CPU.
Technical reference
- Document
- Service manual, Washer extractors W465H-W4300H, W475S-W4330S, W475N-W4330N, Type W3..., Compass Control
- Maker documentation
- Electrolux Professional owner support
- Edition
- 438 9228-61/EN, 2011.08.25
- Models / control
- Electrolux washer-extractors W465H-W4300H, W475S-W4330S, W475N-W4330N (Type W3..., Compass Control)
- Section
- Troubleshooting, printed p.122
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Electrolux Professional industrial laundry error codes
Is the DLCU itself bad?
The manual's action is to replace the CPU board.
Will it clear itself?
A restart may clear a glitch, but a repeat needs the board replaced.
How is it different from code 51?
Code 51 is the same kind of error seen from the DLCU side.
Need help with Electrolux Professional error code 24?
A technician confirms the cause on site and gives you the price in writing before any work starts.