Error E40 in an AEG washing machine

AEG washing machine users may encounter a frustrating problem: the machine starts, runs for a few seconds, and then shuts off, displaying the E40 error code. The only way to restore the machine to working order is to fix the problem. What does the E40 error mean in an AEG washing machine, and what steps should be taken to reset it?

Let's decipher and clarify the code

Each washing machine manufacturer specifies error codes and their interpretations. Error E40 displayed automatically AEG, in most cases, signals a breakdown of the hatch locking device. The AEG washing machine control panel has a diagnostic mode that allows you to pinpoint the cause of a malfunction. If your model doesn't have a dedicated diagnostic mode, you'll have to take a more complex approach:

• simultaneously press the two keys located to the right under the number 1;
• At the same time, press the button under the number 2. You will have to hold the keys down until all the machine indicators start to light up.

If your washing machine has the required programming function, you can simply enter diagnostic mode instead of these steps. You can launch the diagnostic by pressing and holding the two buttons on the right for a couple of seconds.

The diagnostic mode will allow you to clarify the fault; instead of the E40 error, a different, more specific code will be displayed on the unit’s display.

• E41 – informs about a door that is not closed tightly.
• E42 – will tell you about the failure of the hatch locking device.
• E43 – will notify about damage to the triac responsible for the functioning of the door lock.
• E44 – indicates that the drum door opening sensor is faulty.
• E45 – reports a break in the electrical circuit between the control board and the door lock.

Identifying the exact problem will make it easier to fix. With some knowledge of how washing machines work, you can repair the machine yourself. Control board repairs are best left to professionals.

Checking and replacing UBL

The E40 code doesn't always indicate a serious malfunction. It's possible you simply didn't close the door properly. Don't immediately launch the diagnostic mode; try pressing firmly on the door with your knee. Sometimes this actually helps, and the machine resumes washing normally.

If this doesn't help, run the washing machine diagnostics described above or check the washing machine components manually. What if the problem lies in a faulty door lock? To replace the door lock, follow these steps:

• open the hatch, remove the clamp holding the sealing cuff;
• unscrew the bolts securing the UBL;
• remove the lock from the housing;
• Inspect the device contacts. The third and fourth contacts should be closed, the fourth and fifth contacts should be open;
• install the new lock in its original place, connect the wiring;
• secure the cuff with a clamp;
• Run the wash cycle to check the machine's operation.

If the car starts operating normally, the repair is complete. Replacing the locking device will, in the vast majority of cases, clear the E40 error.

You can purchase a replacement lock in specialized stores by specifying the model number of your AEG washing machine.

There is a problem with the power supply of the door lock or the control board.

If the reason for the code being displayed is not a faulty lock, you'll have to dig deeper. The malfunction may be caused by damage to the power supply wiring or the main control board. The lock is connected to the washing machine's "brain" via electrical wires. If the connection is broken, the "home assistant" will alert you by displaying the E40 error code. Each wire will need to be checked using a special device—a multimeter.

If the problem lies with the triac located on the control board and responsible for the door lock, a more complex repair is required. Without proper training, experience, and knowledge, you won't even be able to locate the component on the board. To fix the problem, you'll have to resolder the component. It's best to hire a professional for this type of work.

The E40 error code can be caused by damage to any component in the door unlocking and closing system. To determine the exact cause, each component must be checked.

Thus, the E40 error is caused by various faults in the "Control Board - Hatch Door Lock" circuit. You can fix the problem yourself by replacing the hatch door lock and diagnosing the wiring. If the control triac is faulty, it's best to call a technician. Repairing the control board yourself can increase the cost of the work if done incorrectly.

   

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