Bosch Washing Machine Error F21

⚡ Quick Answer: The Bosch washing machine error F21 indicates a motor-related fault, where the washer fails to properly rotate the drum. This issue may stem from a ma... ⚠️ Difficulty Varies

What Does Error F21 Mean?

The Bosch washing machine error F21 indicates a motor-related fault, where the washer fails to properly rotate the drum. This issue may stem from a malfunctioning motor feedback sensor (tachogenerator/Hall sensor), worn motor brushes, or wiring issues. Symptoms include the machine stopping mid-cycle, failure to spin, and unusual noises during operation. Prompt attention to these issues can prevent further damage and ensure your washer operates smoothly.

Common Symptoms:

  • Washing machine stops and displays F21 error
  • Drum fails to spin or stalls during spin attempts
  • Error appears after several motor start attempts
  • Machine may freeze mid cycle

Possible Causes

  • Motor feedback sensor (tachogenerator/Hall sensor) failure or inaccurate RPM signal (medium)
  • Worn motor brushes or motor failures (medium)
  • Wiring/connectivity issues between motor and control board (medium)

How to Fix Error F21

DIY Fix Perform basic power reset and visual checks

  1. Turn off the washing machine and unplug it from the power outlet.
  2. Wait 10–15 minutes to allow residual power to dissipate, then plug it back in and restart.
  3. Check that the drum can be rotated manually (with the machine off) to rule out mechanical jam.
  4. Ensure the machine is level and not overloaded.

Technician Only Inspect motor feedback sensor and associated components

  1. Disconnect power and access the motor area (remove rear or front panel as appropriate).
  2. Test the tachogenerator/Hall sensor with a multimeter for expected resistance/voltage outputs.
  3. Check motor brushes for wear and replace if contact length is insufficient.
  4. Inspect wiring/connectors between the motor, sensor, and control board for damage or corrosion.
  5. Reassemble and test machine operation; apply control board diagnostics as needed.

Parts needed: Tachogenerator/Hall sensor, Motor brushes, Motor assembly, Wiring harness

🛑 When to Call a Pro:
  • If you are not comfortable accessing internal components
  • If motor/sensor tests cannot be performed or error persists after basic reset
  • If signs of electrical damage, burning smell, or water ingress are present

Technical Specifications

wattage 50W
component Drain Pump
resistance 10-30 ohms
part_number Bosch 00167036
voltage_rating 120V AC

Common Questions

What does F21 error mean on bosch washing machine?

The F21 error indicates a motor-related fault, preventing the drum from spinning properly.

Can I fix bosch washing machine F21 error myself?

Yes, perform a power reset and check for manual drum rotation to troubleshoot.

How much does it cost to fix F21 error?

Repair costs range from £80 to £300+, depending on parts and labor.

When should I call a technician for F21?

Call a technician if you're uncomfortable with internal repairs or if issues persist after basic troubleshooting.

Data last verified: 2026-07-07

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