Error f21 Siemens washing machine how to fix?

What does error f21 mean?

With this signal, the device reports incorrect operation of the management system. When the unit issues an error code like this, the set program is automatically interrupted. This malfunction is due to several reasons:

• the drive belt functions unevenly;
• for a number of reasons, the belt is not capable of transmitting rotational motion to the drum of the Siemens unit;
• there was a short circuit on the triacs;
• brush wear;
• the tachogenerator failed;
• reverse relay malfunction.

There is only one solution - replace the failed element.

Module faults

If you do not understand electronic circuits and do not understand the operating principles of an automatic washing machine, then it is better to entrust the repair of the control board to a trusted technician or a specialized service that provides service with a guarantee. Even installing a new module is not so easy. If you mix up the contacts or chips, it can burn out completely.

And they cost quite a lot - from 7 thousand to 20 thousand rubles for individual models.

For Bosch and Siemens washing machines, it is not enough to fix the problem that led to error F21. It still needs to be reset. Without following this procedure it will not work.

Different models have their own methods. Let's consider one of them:

1. Set the program selection knob to position “0”.
2. Counterclockwise we move one division.
3. Press the “Start” button and hold it for a few seconds.
4. Return the handle to the neutral position.
5. We wait for a while.
6. The error has cleared.

It is not always possible to do it right away. Sometimes you need to repeat 5-10 times.

Important! On some models it only works when the “spin” button is pressed! Do you wash by hand?

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How to resolve the error

To make sure that the Siemens washing machine produces error f21 due to a faulty tachogenerator or worn brushes, you will have to dismantle the electric motor. The procedure is responsible. It implies the presence of sufficient physical strength, because the washing machine will have to be tilted for ease of operation. The algorithm of actions is as follows:

• the device is disconnected from all communication lines - electricity, water and sewerage;
• the screws are unscrewed, the top panel is removed to make it easier to work;
• the back cover of the case is dismantled;
• the drive belt pulls off;
• The screws securing the motor of the Siemens washing machine are unscrewed. To do this, it is recommended to use a ratchet wrench;
• if you are looking at the washing machine from the front, it must be tilted to the left side;
• the grounding chip is disconnected;
• the motor is removed from the car.

Masters recommend performing such work with gloves so as not to injure your hands.

The tachogenerator is checked using a tester. The device should not indicate the presence of a break or low voltage. Here it is fair to note that error code f21 is rarely displayed due to a failure of the tachogenerator, since a Siemens washing machine is famous for its reliability.

Brushes are checked visually. To do this, you need to remove them from the holder, first taking out the bar made of brass material and disconnecting the contacts from it.

Replacement is carried out when the length of the old brushes does not exceed one centimeter.

What failures does the code cause?

The main merit of Siemens machine fault codes is that they allow you to narrow down the search for a breakdown. So, the illuminated inscription from F21 indicates a forced stop of the drum. To correct the situation, we first correctly diagnose the source of the problem. They may be:

• broken tachogenerator;
• worn electric brushes;
• burnt triacs;
• damaged reverse relay.

The mentioned malfunctions prevent the full functioning of the control system and the operation of the motor. The drum stops rotating and the machine cancels the set cycle. Despite the seriousness of the breakdown, you can determine the causes and carry out repair work yourself. Step-by-step instructions on what to do when error F21 appears looks like this.

1. Disconnect the washing machine from communications.
2. Unscrew the two screws at the back and slide the top cover.
3. Remove the back wall.
4. Remove the drive belt.
5. Turn the machine over to its left side.
6. Loosen the screws holding the motor.
7. We disconnect the supply wires, the chip and the ground.
8. We sharply pull the engine towards ourselves.

Having placed the engine on a flat surface, we begin to sequentially check it for existing faults. First of all, let's inspect the tachometer generator. On Siemens machines, this sensor breaks down extremely rarely, so its failure is unlikely.

We test with a multimeter, connect the probes to the contacts and evaluate the result: the final voltage should not be high.

Next, we turn our attention to electric brushes. They are located on both sides of the engine and are removed from the housing after unscrewing the retaining bolts. We take them out of the holders by pulling out the brass bar and carefully disconnecting the contacts, and measure the carbon tip. If the length is less than 0.7-1 cm, we replace both brushes with new ones.

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Grinding in the brushes

First of all, we check the collector lamellas for integrity. If they deflate, we sharpen them, but such a measure is considered temporary. This motor will have to be replaced or a new rotor selected. We remove brush dust from the motor and clean the grooves of the lamellas. New brushes are installed taking into account the inclination towards the rotor.

The grinding is carried out as follows:

1. Having replaced the brushes, we return the motor to its place and fix it with screws;
2. connect the grounding and chips with wires;
3. set the minimum speed, activate the spin program;
4. To be completely sure, we run the named function again;
5. install the drive belt;
6. We perform complete assembly of a Siemens washing machine;
7. We don’t put dirty things in the drum, we start a program whose duration is one hour, set the speed to low, turn on the machine;
8. after such a check, you can wash it, but the first two or three loads of the drum are carried out at fifty percent of the permitted norm;
9. Only after such checks can the unit be used in full mode - error f21 on the Siemens SMA will not bother you.

Checking the engine correctly

Do-it-yourself repairs continue with a more complex procedure - checking the engine for the integrity of the lamellas. To do this, completely remove the rotor from the motor and inspect the collector. If peeling or blowing is noticeable, it is necessary to replace the engine or rotor (if peeling is up to 0.5 mm, you can temporarily sharpen the surface).

Be sure to clean the engine housing from any existing dust and contaminants. We pay special attention to the grooves between the lamellas and polish the entire surface. You should not neglect grinding in, which is carried out like this:

• install the motor back;
• connect the wires (do not put on the drive belt);
• run the spin cycle twice at minimum speed;
• return the belt to its place;
• We turn on a mode lasting at least an hour with an empty drum and minimal spin.

Afterwards we take precautions. For the first 2-3 cycles, load the drum halfway and select low powers. Next, we use the machine in the usual way.

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How to reset error f21

Eliminating the cause of this error code in the washing machine is only half the battle. The second step is to perform a reset. If this procedure is ignored, the machine will not start to function.

The problem is that different models have their own methods; for example, let’s look at the procedure for modifying the Siemens iq 300:

• the knob intended for selecting programs is moved to position “0”;
• a shift is performed by one division in the direction opposite to the direction of the clock hand;
• Press the “Start” key and hold it for several seconds;
• move the handle to the neutral position;
• we wait for some time;
• Fault code f21 should be reset.

It should be noted that it is not always possible to reset on the first try. Sometimes the given algorithm is with the “Spin” key.

After renovation

To continue washing, in Siemens machines it is necessary not only to fix the breakdown, but also to reset the signal code. The error cancellation algorithm for different models may differ, but not critically. Most often, it is enough to take the following steps:

• turn the program selector to position “0”;
• move one space to the left;
• press “Start” and hold for 2-3 seconds;
• return the cursor to its previous position.

You just have to wait a little, after which the code will be reset and the machine will be ready to start. Often the procedure has to be repeated several times. Sometimes instead of “Start” you have to try the “Spin” button.

Error F21 can occur in Bosch, Siemens washing machines of any brand, such as, for example, Maxx 5 and Max 7. Any attempts to start will lead to nothing until the breakdown is repaired and the fault code is reset. This indicates problems with the motor or control system.

Causes:

1. Tachogenerator malfunction.
2. The brushes are worn out.
3. The triac burned out.
4. The relay that switches engine speed is damaged.

To check the first two points, you need to remove the motor. This is an important procedure that requires physical strength, because...

You will need to tilt the washing machine. Let's look at the necessary step-by-step actions:

1. We disconnect from electricity and water supply, as well as sewerage.
2. Remove the top cover by unscrewing two screws. This should be done for convenience.
3. We dismantle the back bar.
4. Pull off the drive belt.
5. Unscrew the screws securing the engine. It is most convenient to use a ratchet wrench.
6. We turn the car over on its left side when looking at it from the front. It is important!
7. We pull out the chip and grounding.
8. We remove the engine.

Important! Wear protective gloves while working. You may hurt your hands.

None Brushes are diagnosed visually only. To do this, you need to remove them from the holders, first pulling out the brass bar and removing the contacts from it.

Important! If the length of the brushes is less than 1 cm, then replacement is required!

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Siemens washing machine - error code f17, f18, f23, f57

Modern German Siemens washing machines very often have a self-diagnosis system. With its help, the device detects a breakdown and reports it by displaying a fault code on the screen. To decrypt the message, you need to refer to the operating instructions. Having determined what defect the error code indicates, the owner of the equipment will understand whether he is able to fix the problem himself or whether he needs to seek help from professionals.

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Adviсe

Siemens washing machines are reliable and have a long service life. The equipment will work flawlessly with proper care.

Here are some basic tips.

1. Tap water for washing should be softened. Special filters or powders are suitable for this. This will prevent scale formation on the heating element.
2. Before you start washing, you need to check all the pockets of your clothes so that small objects do not get into the washing machine. They can cause serious damage to the sensors, drum and even the motor.
3. Hoses and filters should be inspected every six months. If there are blockages, the parts should be removed and washed with running water.
4. It is recommended to clean the washing powder compartment and drum once a month.
5. Do not overload the equipment. Operating at maximum load will lead to rapid wear of the motor and other parts.
6. Do not leave the washing machine door open for a long time. Moreover, you can’t put things on it. This will lead to rapid wear of the hinges, and the hatch will no longer close.

To learn how to resolve error F23, watch the video.

Elimination

Actions must be taken based on the malfunction. For example, if fault F04 is displayed, then you need to find and fix the leak. If you need to unlock the control panel to solve the problem, you can restart the washing machine.

It is important to first turn off the power using the button, then unplug the power cord from the outlet.

Troubleshooting common errors:

1. If there is a problem with the hatch door, you should first make sure that clothing does not interfere with closing. Then the blocking system is inspected for damage. Also, the door may not close due to wear on the hinges or rubber seal. It is worth checking these parts and replacing if necessary.
2. To eliminate error F02, you should check whether there is water in the pipes and whether the supply valve is closed. If everything is in order, then it is worth inspecting the hose and filters. There is probably a blockage somewhere - it is enough to remove it for the code to disappear.
3. Code F03 needs to be corrected sequentially. First, the filters are inspected and cleaned if necessary. Then you should check the drainage pump for defects. If the pump is broken, you should contact a service center. You will also have to call a technician if the failure is in the control module.
4. If Aquastop breaks down (error F23), you should check the contacts and replace them if necessary. If there is no breakage in the wires, then the sensor itself should be examined. The part will have to be replaced if it fails.
5. If any sensor fails, then first you need to check its contacts. If everything is normal with them, then you should inspect the part itself for defects. If there are any, the sensor should be replaced with a new one.
6. To eliminate error F31, you need to check the fill valve and drain pump, pressure sensor. If all parts are normal, then you should find and eliminate the blockage in the drain system. It happens that such simple actions do not help. This means the cause of the error is in the wiring. You'll have to change the wires.
7. If synchronization fails (F40), just restart the washing machine. If this does not help, then you will have to call a specialist.
8. To eliminate F67, you need to restart the equipment and encode the card again. If this does not help, you will have to replace the part.

It is highly not recommended to fix critical errors yourself. Incompetent repairs can lead to the equipment becoming completely inoperable.

You should immediately contact the service center and call a technician. You can only deal with typical, minor breakdowns on your own.