Troubleshoot error code “F21” in Bosch washing machine

How to eliminate F21 error in Bosch washing machine?

  • Error: F21
  • Description: Motor failure detected.
  • Cause: Faulty tachometer sensor, malfunctioning motor, damaged wiring, foreign object in the drum, voltage drop in the electrical network.
  • Solution: Check and remove foreign objects, verify the voltage in the electrical network, inspect the motor and Hall sensor, replace the faulty Hall sensor, and consider replacing the motor if necessary.

Error: F21

The F21 error in a Bosch washing machine can appear as an alphanumeric code or as a set of flashing indicators on the control panel. This error indicates a malfunction in the washer, and it is important to take measures to resolve it. Below is a structure to address this issue, including a brief description, possible causes, and recommended solutions.

Description:

The F21 error in a Bosch washing machine indicates a malfunction in the appliance. It can manifest as an alphanumeric code or as a set of flashing indicators on the control panel.

Possible causes:

  1. Faulty tachometer sensor: The module does not receive information about the motor speed due to a damaged tachometer sensor, which stops the washer and displays the F21 error code.
  2. Malfunctioning motor: If the motor is broken, it will not be able to rotate the drum, resulting in multiple startup attempts and triggering the F21 error.
  3. Damaged wiring: A cable that supplies power to the motor or Hall sensor may be broken or corroded, affecting the power transmission and causing the F21 error.
  4. Foreign object: The presence of a foreign object, such as coins, pins, or other items, in the washer drum can prevent its rotation and generate the F21 error code.
  5. Voltage drop: A voltage drop in the electrical network can affect the washer’s operation and activate the F21 error code.
  6. Faulty Hall sensor: The Hall sensor, also known as a tachogenerator sensor, may have failures, which can also trigger the F21 error.

Recommended solutions:

  1. Check and remove foreign objects: Before proceeding with other solutions, it is advisable to inspect the washer drum for foreign objects and remove them if found.
  2. Verify the voltage in the electrical network: Check for voltage drops in the electrical network and take necessary measures to resolve this issue.
  3. Inspect the motor and Hall sensor: Disassemble the washer and check the condition of the motor and Hall sensor. Take photographs of the cable and fastener locations before disassembling to facilitate the reassembly process.
  4. Replace the faulty Hall sensor: If it is determined that the Hall sensor is damaged, it is recommended to replace it with a new one to resolve the F21 error.
  5. Consider replacing the motor: If the motor has severe problems, such as leakage current or damaged windings, it may be necessary to replace it entirely.

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