Error F21 (E21) of the Bosch washing machine: what does the code that the Bosch washing machine produces mean, how to detect the problem and fix it, how to reset it?

Bosch washing machine code E21 - what is it?

The Bosch washing machine signals the impossibility of rotating the drum with error f21 (e21) on the control panel display.

In a situation where the washing machine is not equipped with an information display, you can find out about the problem that the drum rotation is blocked by the blinking indicators:

The Bosch Classixx model signals error e21 by flashing the “Rinse” mode indicator (second light from the bottom).
The Bosch Maxx 4 model reports an error by flashing the “Ready for use” and “End of washing” indicators (first and third from the bottom).
The Bosch Maxx 5, 6 or 7 model indicates a malfunction by simultaneous flashing of the spin speed indicators (1000, 800) and the Rinse mode indicator.

If error e21 occurs, the washing machine should be turned off immediately. Otherwise, when diagnosing and fixing the problem, there is a high risk of electric shock.

Description

When using Bosch equipment, error F21 may appear not only in the form of a code of letters and numbers. On Bosch models that do not contain a display, the fault is indicated by a combination of flashing indicators located on the control panel.

Flashing indicators allow you to recognize a number of errors. Technicians who have extensive experience working with similar washing machines determine error code F21 offhand. But an ordinary user can also identify an error using indicators. To do this you will need a table of error codes.

On Bosch washing machines without a display, error F21 is displayed as follows. The washing machine freezes and does not respond to button presses. Also, the machine does not respond to turns of the program selector. At this moment, 3 lights on the control panel flash or light up at once: rinse, 800 revolutions and 1000 revolutions.

You can see how the F21 code is displayed on Bosch machines without a display in the picture below.

Older models spin at a maximum of 800 rpm. In this case, the rinse, 600 and 800 rpm indicators will light up.

Code F21 has a fairly simple interpretation. However, this does not mean that determining the causes of its occurrence will be easy.

This error may appear if the following malfunctions occur:

Call the master

In a situation where attempts to independently resolve error e21 were unsuccessful, a service center technician will help restore the functionality of the Bosch washing machine. It is enough to leave a request by phone or on the website of a specialized company (the coordinates are easy to find on the Internet). The application indicates the model of the washing machine, the year of manufacture of the device, and the essence of the problem.

A professional technician will carry out diagnostics, quickly determine the cause of error E21, and eliminate the malfunction. On average, the cost of services to eliminate the E21 error varies from 1,500 rubles. up to 5000 rub. (urgency of the order increases the amount due).

To avoid falling for scammers, before leaving a request, it’s a good idea to find reviews from those who have already used the services of the selected specialist. You cannot pay for repairs that have not yet been completed! Otherwise, there is a high risk of being left without money and without a repaired washing machine.

Error F21 in a Bosch washing machine - how to fix it

When starting the Bosch washing machine, the drum does not rotate; the display shows error F 21. Let's look at what this means.

The drum may also stop mid-wash.

Electromechanical BOSCH CM models display an error by flashing (lighting) the speed (1000-800, 800-600) and rinse lights.

Note! Error code F21 for a Bosch washing machine is critical. You need to immediately turn off the power to the machine.

What does an error mean: solving the problem yourself

Before troubleshooting, do the following:

If the wash is not completed, interrupt the program.
Turn off the power to the washer.
Drain by hand.
Remove the laundry and wipe the drum.

Now look at the operating instructions for your Bosch washing machine. You may have overloaded the tank with laundry, so the error cannot be cleared and the drum does not spin.

How to fix the situation: load less laundry, try running the wash again. If everything works and error F21 has been reset in the Bosch washing machine, then the problem is solved.

Troubleshooting and repair

To ensure that the fault code no longer appears, you need to find the breakdown. Pay attention to whether the drum rotates by hand.

If the drum does not spin during washing, but rotates manually, check the details:

Drive belt

The belt drives the drum, transmitting engine speed. If it becomes loose or worn, transmission will be disrupted. If the belt bursts or falls off the pulley, there will be no rotation at all.

What do we have to do:

Unplug your Bosch machine.
Remove the back wall of the washer by unscrewing the bolts.
Check the condition of the belt. Replace if necessary.
Select the appropriate drive for your Bosch washing machine model.
Slide the belt onto the small pulley first, then onto the large pulley, rotating it until it fits snugly.

If these steps do not resolve the error, read on.

Control block

When error F 21 appears on the Bosch washing machine display, the cause may be a failure of the electronics. The controller does not send a signal to start the wash.

You need to remove the control module, check all connections and board elements. If necessary, replace the unit.

Carbon brushes

When the motor's carbon brushes wear out, the rotor will not rotate. To check and replace the brushes you will have to remove the engine.

Failure of the engine (motor)

To determine exactly where the breakdown occurred, the engine must be thoroughly checked. After all, the cause may be an open circuit, a short circuit in the winding, or a breakdown of the tachometer.

If the motor is proven to be faulty, a new element must be installed. Perhaps this will help eliminate error code 21 from a Bosch washing machine.

If the drum is jammed and it does not turn by hand, then continue checking.

Foreign object

It happens that a small object ends up between the tank and the drum, which interferes with normal operation and causes error F21: coins, buttons, bra underwires and other items of clothing that get caught in the gap during washing.

It is important to remove the item immediately or it could damage the tank, causing water leakage and costly repairs. How to do it:

Unplug your Bosch washing machine.
Pull the hatch cuff.
You may notice a foreign object and be able to remove it.
To further search, remove the front panel of the machine.
Take out the heating element (heater) at the bottom. It happens that the fabric clings to its tube, then you just have to remove it.
If there is nothing, shine a flashlight into the heating element hole and remove the object.
All is clear? Then place the Bosch SM on its side.
Below you will see a pipe. Loosen the clamp and disconnect the pipe.
The opened hole will allow you to look into the tank and check everything. This video will help you:

Bearing failure

If the bearing is worn out, you will hear noise and hum during operation of the CM. Changing a bearing is not easy, but you can try:

Turn off the power to the car, turn off communications.
Remove the top panel.
Pull out the powder dispenser by pressing the lock in the middle.
Unscrew the screws securing the control panel and remove it.
Remove the bottom panel and unscrew the screws holding the front panel of the washing machine.
Now you need to remove the hatch cuff. To do this, remove the metal clamp using a screwdriver. Pull the cuff to access the clamp.
Unscrew the two bolts securing the UBL (hatch lock).
Bend the cuff and pull out the lock, then remove the entire panel.
Remove the dispenser tray and remove the counterweights.
Pull out the heating element and then the drain pipe.
Remove the motor and pressure take-off chamber.
Remove the tank from the springs and place it on the surface.
Remove the cuff from the door and turn the tank over.
By removing the pulley you will get to the bearing.

You can now perform the replacement.

This video will help you disassemble your Bosch washing machine and replace the bearing:

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Source: https://cosmo-frost.ru/oshibki-stiralnyx-mashin/bosch/oshibka-f21-v-stiralnoj-mashine-bosh/

How can I prevent future breakdowns?

prevent problems that provoke error e21 :

Before loading into the drum, the pockets of dirty clothes must be checked for the presence of foreign objects, buttons and other small accessories are checked for strength.
Small items of clothing, as well as underwear and socks are washed in special mesh bags.
Connecting the washing machine through a special voltage relay will help avoid breakdowns caused by a sudden surge in voltage in the network.

Strict adherence to all the manufacturer’s recommendations specified in the passport of the household appliance will help you operate the washing machine for as long as possible without repair.

Adviсe

Often code e21 is a signal that the washing machine drum is overloaded . To understand whether this is true, you need to unplug the power cord from the outlet, manually drain the water, reload the drum, and start a new wash cycle.

Before testing the tachogenerator with a multimeter, the sensor must be carefully cleaned of oxide deposits, otherwise the test data may be incorrect.

After the cause of error e21 has been eliminated, additional steps must be taken to reset the error. How to reset the code? To do this, set the selector switch to the “Off” position, then “Spin”, hold down the drum speed switch button for a few seconds, set the selector knob to the “Drain” mode, and press the speed switch button again for a couple of seconds.

Error code E21/F21 Bosch washing machine: what does it mean

First of all, if error F21 occurs, it is recommended to disconnect the Bosch washing machine from the network, since a common cause of the malfunction is related to voltage surges and further operation of the equipment can be dangerous.

There may be other problems not related to the power supply of the device, which can harm the machine during use. If there is water left in the washer, after unplugging it from the power supply, you must drain the water manually.

Description of the error code

When this error occurs, the drum does not rotate when starting the equipment. When a Bosch washing machine is operating, error F21 may appear not only in the form of a code consisting of letters and numbers, but also in the form of flashing indicators located on the control panel. This happens because in some models there is no display and there is no way to display information.

With the help of flashing lights, it is not difficult to identify the problem associated with the E21 code. Three lights flash: spin speed 800 - 1000 and 600 - 800, as well as a rinse indicator. At the same time, the equipment freezes and does not respond to button presses or turns of the program switch.

Decoding fault indicators

Error code E21 stands for the inability to rotate the drum. The washing machine may try to start spinning several times; if the result is negative, code F21 appears on the control panel. Failures when trying to start the reel rotation can occur for several reasons:

Malfunction of the Hall sensor - information about the motor speed is not transmitted to the control module and it stops the operation of the washing machine.
Motor failure - a faulty motor cannot rotate the drum; the module displays an error after several startup attempts. The malfunction may occur due to wear on the carbon brushes.
Problem with the belt driving the drum - wear, stretching, weakening, misalignment or breakage of the drive belt will cause the drum to malfunction or stop rotating.
A foreign object that gets into the tub during washing can jam the drum.
Voltage drop in the network.

To identify the cause of the malfunction, it is recommended to check all points in a certain order until the problem is detected.

Solution: algorithm for identifying the cause and troubleshooting

Often error F21 in Bosch washing machines occurs due to loading too much laundry. If removing part of it and restarting it did not help solve the problem, you can proceed to the next verification step.

After freeing the machine from the laundry, you need to pay attention to whether the drum rotates when scrolled by hand. If it does not spin during washing, but rotates manually, the belt is checked. If the drum does not rotate manually, you should check the machine part for foreign objects. They can get into the space between the tank and the drum.

If after checking the cause was not found, not only the Bosch washing machine is checked, error E21 could be caused by a sharp drop in voltage in the electrical network.

Next, if necessary, the body parts are checked: tachometer, motor, carbon brushes.

Drive belt problems

To check wear or displacement of a part, you should disconnect the washing machine from the power supply and remove the back panel by unscrewing the bolts. Next, you can start checking the belt. If necessary, the part should be replaced: the belt is put on first on the small pulley, then on the large pulley; for a tight fit, it is recommended to spin the spare part.

Hall sensor malfunction

To check the tachometer, the washing machine is disconnected from the network, after which the back panel is dismantled and the drive belt is removed.

Difficulties with the engine

A thorough check of the engine will be required to determine where the problem is occurring. If the malfunction occurs due to wear on the carbon brushes, it is enough to replace them. In case of other engine breakdowns, in most cases, the entire engine is replaced.

After fixing the problem, you will need to reset the error. To do this, turn the program switch to the “off” position and set the selector to “spin”.

After this, wait for the code to appear on the control panel and hold down the drum speed switch button for a few seconds. Then set the switch to the “drain” position and hold down the speed switch key again.

The appearance of a characteristic sound signal and the simultaneous turning on of all lights for a short period of time indicate a successful reset.

We managed to determine the cause of E21, but still need a part? Order from Samodelkin: inexpensive, fast delivery, guarantee.

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: how to reset error F21

Source: https://Samodelkin-mag.ru/master/kodyi-oshibok-stiralnyix-mashin-bosch/e21