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
- Turn off the washing machine and unplug it from the power outlet.
- Wait 10–15 minutes to allow residual power to dissipate, then plug it back in and restart.
- Check that the drum can be rotated manually (with the machine off) to rule out mechanical jam.
- Ensure the machine is level and not overloaded.
Technician Only Inspect motor feedback sensor and associated components
- Disconnect power and access the motor area (remove rear or front panel as appropriate).
- Test the tachogenerator/Hall sensor with a multimeter for expected resistance/voltage outputs.
- Check motor brushes for wear and replace if contact length is insufficient.
- Inspect wiring/connectors between the motor, sensor, and control board for damage or corrosion.
- Reassemble and test machine operation; apply control board diagnostics as needed.
Parts needed: Tachogenerator/Hall sensor, Motor brushes, Motor assembly, Wiring harness
- 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
Next step
Choose the next step for F21
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
- Typical part-only price
- $20 - $120
- DIY difficulty
- Medium
- Estimated time
- 30-90 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Washing Machine parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
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Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Washing Machine Cleaner Tablets
Routine tub-cleaning supplies for residue and odor control. They do not repair a mechanical, drainage, or electronic fault.
Braided Washer Inlet Hoses
A maintenance replacement option for visibly worn external fill hoses. Verify thread size, length, and hot/cold connection requirements.
Washer Drain Hose Holder
Helps secure an external drain hose at the standpipe. It does not correct an internal pump or control fault.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
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: 2026-07-25
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