Washer High Severity
F21 Appliance Error Code

Bosch Washer F21 Error: Motor Fault

What Does Bosch Washer Error Code F21 Mean? Error code F21 on a Bosch washing machine indicates a motor failure. The drive motor is unable to operate at the required speed — it may have worn brushes, an overheating condition, or a control module failure. Common Causes Worn motor brushes are the most common cause […]

Quick Assessment

Answer to continue safely

Is it safe to keep using?

No. Do not continue using the washer if the motor smells hot. Continued operation risks electrical damage or fire.

Can I reset the code?

Yes. If caused by temporary overheating, allowing the motor to cool and resetting may work. Persistent F21 requires repair.

When to stop immediately?

Stop if you notice: Burning smell from the motor, Circuit breaker trips when washer starts.

Symptoms You May Notice

Drum doesn't spin or agitate

The washer powers on but the drum does not move during wash or spin cycles.

Burning smell from motor area

A hot electrical or burning rubber smell comes from the rear or bottom of the washer.

Washer trips the circuit breaker

The household breaker for the washer circuit trips when the motor tries to start.

Possible Causes

1

Worn motor brushes

Carbon brushes that transfer electricity to the motor armature have worn down below usable length.

Requires Professional
2

Motor overheating

The motor has overheated from excessive load or blocked ventilation.

Requires Professional
3

Failed motor control module

The inverter or motor control board that regulates motor speed has failed.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Let the motor cool

    Turn off the washer and wait 30 minutes for the motor to cool down before attempting to restart.

    Motor overheating from a heavy load can trigger F21 temporarily.

  2. 2

    Reduce the load

    Remove some items from the drum. An overloaded washer puts excessive strain on the motor.

    Never fill the drum more than 3/4 full for regular wash cycles.

When to Call a Professional

Contact a qualified technician if:

  • Motor brushes are visibly worn down
  • Motor draws excessive current on startup
  • Motor control module shows fault in diagnostics

Need Professional Help?

Find qualified technicians in your area for proper diagnostics and repair.

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