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Error F21 in a Siemens washing machine

Error F21 in a Siemens washing machineRegardless of the model and configuration, the F21 error in the Siemens washing machine says one thing - there was a serious breakdown. It will not work to start the machine and continue washing: first you need to fix the fault and reset the signal code. You will have to pay attention to the washing machine engine and control system. How to restore the performance of the "home assistant" without exacerbating the problem, we will describe in step-by-step instructions and explanations.

What kind of breakdown causes the code

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

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

The mentioned malfunctions impede the full functioning of the control system and the operation of the motor. The drum stops rotating, and the machine cancels the specified cycle. Despite the seriousness of the breakdown, it is possible to determine the causes and carry out repair work independently. A step-by-step instruction on what to do when an F21 error occurs looks like this.

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

Putting the engine on a flat surface, we begin to consistently check it for an existing malfunction. First of all, we will examine the tachometric generator. On Siemens machines, this sensor breaks 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 large.

Next, pay attention to the electrobrushes. They are located on both sides of the engine and removed from the housing after unscrewing the holding bolts. We take them out of the holders by stretching out the brass strip 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.

Checking the engine correctly

Do-it-yourself repairs continue with a more complicated 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 (when peeling to 0.5 mm, the surface can be temporarily undermined).

check lamelsBe sure to clean the engine housing from existing dust and contaminants. We pay special attention to the grooves between the lamellas and polishing the entire surface. Do not neglect and grinding, which is carried out as follows:

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

After we observe the precautionary measures. The first 2-3 cycles load the drum halfway and select low power. Next - we use the machine in the usual way.

After repair

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

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

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

   

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