Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- Burning electrical smell
- Motor or wiring becomes hot
- Breaker trips or movement is seized
Likely causes
- Motor or pump is overloaded or blocked
- Foreign object prevents movement
- Speed or position feedback is missing
- Inverter, wiring, or control is faulty
Quick checks, in order
Remove excess load or accessible debris
Do not force moving parts.
Listen during one short test
Note humming, clicking, grinding, or silence.
Allow a brief cool-down
An overloaded motor may reset after cooling.
Stop before motor or inverter work
Internal drive components need qualified service.
What happens when F21 appears?
A jam, overload, or failed drive is possible.
Load, friction, suspension, or weak drive may be involved.
Sensor, wiring, inverter, or control is more likely.
Stop and get qualified help when
- Burning electrical smell
- Motor or wiring becomes hot
- Breaker trips or movement is seized
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does F21 mean on a Bosch washer?
On many model families, F21 indicates that the motor cannot rotate. Confirm the exact model and region because the same display can be used differently.
Can I clear F21 by unplugging the washer?
A short power reset may clear a temporary state, but it will not fix a blocked hose, leak, failed sensor, motor, heater, or wiring fault. Stop if the code returns.
Should I replace a part based only on the code?
No. A code identifies a system or condition, not always the failed component. Complete safe external checks and use the model-specific manual or qualified service.