You’re not the only one who sees error code E21 when using a Siemens washing machine. This is a common problem that many users encounter and can be perplexing and annoying. But fear not—a solution exists.
Error E21 usually indicates that there is a draining issue with the machine. Numerous things, like a clogged filter or a blocked drain pump, can cause this. Knowing what’s causing this error and how to fix it will help you avoid more problems and save time.
This post will define error E21, look at some common causes, and walk you through the steps to fix it. You can quickly restore the smooth operation of your Siemens washing machine by adhering to these easy instructions.
- Faults that you will encounter
- Are the lamellas intact?
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Faults that you will encounter
The self-diagnosis system’s greatest feature is that it greatly simplifies locating the breakdown. Error E21 indicates that the Siemens motor in the washing machine has failed, which prevents the machine from spinning the drum. The reason could be:
- faulty Hall sensor;
- worn carbon brushes;
- problems with the lamellas or motor winding;
- failure in the control board (burnt out triac or damaged relay).
If any of the listed issues exist, the washing machine’s motor won’t start. The result is that the drum stays still, the system logs that the command was not followed, quickly stops the cycle, and shows the error code E21 on the screen. However, the majority of issues can be readily resolved at home, so there’s no need to be afraid of the combination. Here are the steps to follow in the event that the E21 error appears:
- de-energize Siemens and turn off the water supply;
- unscrew the two screws from the back wall and remove the top cover;
- disconnect the back panel from the case;
- pull the drive belt off the pulley;
- lay the machine on its left side;
- find the motor located under the tank on the right;
- disconnect the power supply wiring;
- loosen the fasteners holding the engine;
- pull the engine out of the "socket" by pulling it towards you.
To resolve the E21 error on a Siemens washing machine, a comprehensive diagnosis of every component of the motor unit—from the control board to the tacho sensor—is necessary. The tachogenerator is inspected first. It is supposed to monitor the motor’s speed, but if it malfunctions or becomes too big to handle, it stops sending data to the module, which interrupts the cycle in response. A multimeter is used for testing the tachogenerator:
- turn on the ohmmeter mode;
- touch the sensor contacts with the probes;
- look at the display (the recorded resistance should not be large).
Next, using your hands, examine the electric brushes that are fixed to both sides of the engine. To remove the carbon tips from the case, unscrew the screws holding them in place, disconnect the wires that are connected, and move the contacts. Using a ruler, measure the length of the released "coals"; if it is less than 0.7–1 cm, replacement is required.
A Siemens washing machine’s Error E21 indicates that there is an issue with the machine’s water drain. A kinked drain hose, a blocked filter, or a clogged drain pump could be the source of this problem. You can save time and possibly avoid expensive repairs by learning how to troubleshoot this error and quickly resolving the common causes, which will allow you to get your washing machine back to normal operation.
Are the lamellas intact?
Verifying the integrity of the lamellas is the next step in the repair process. These are metal plates that facilitate the flow of current between the engine’s components. The motor stops if there is peeling or blowing off, which prevents the voltage from being transmitted. It is required to take the rotor out of the engine and closely examine its surface in order to check the lamellas. A sharpening machine or sandpaper can be used to rectify a small peeling of up to 0.5 cm. In other situations, just swap out the engine.
We "clean" the Siemens washing machine engine in the process of diagnosing the lamellas. We clean the grooves, dust off the body, and polish it. Additionally, it is advised to use wiping:
- return the engine to the “nest”;
- connect the wiring;
- do not tighten the belt;
- start the spin cycle at minimum speed twice;
- put on the belt and start the wash for an hour.
It is advised to wash for two to three cycles in the "gentle" mode after that. Turning on programs with the least amount of spin and halfway loading the drum is sufficient.
| Issue | Description |
| Error E21 | The washing machine is not draining water properly. |
| Possible Cause | A clogged drain filter or hose, or a malfunctioning pump. |
| Solution | Check and clean the drain filter and hose, and inspect the pump for any damage or blockages. |
When a Siemens washing machine displays error E21, it usually indicates a drainage problem, which is frequently brought on by a clogged filter or a broken drain pump. Knowing the reasons behind this error will enable you to locate the issue and take the necessary action to fix it as soon as possible.
In the event that this error occurs, begin by looking for any obstructions in the drain hose and filter. Usually, the problem can be fixed by removing any obstructions. The drain pump may need to be inspected or replaced if the issue continues, particularly if you hear strange noises or observe that the water is not draining correctly.
Error E21 can be avoided in the future with routine maintenance, such as filter cleaning and drain hose inspection. Maintaining the condition of your washing machine will guarantee that it keeps working effectively, saving you time and preventing the inconvenience of unplanned repairs.
