Bosch Dryer Error E21
⚡ Quick Answer: The Bosch dryer E21 error code typically indicates a malfunction related to the heating element, which can prevent the dryer from producing heat durin... ✅ DIY Fixable
What Does Error E21 Mean?
The Bosch dryer E21 error code typically indicates a malfunction related to the heating element, which can prevent the dryer from producing heat during operation. Users experiencing this issue may notice that their clothes remain damp after a drying cycle. If basic troubleshooting such as resetting the dryer or ensuring the lint filter is clean does not resolve the problem, further investigation may be necessary.
Possible Causes
- Heating Element
- Thermal Fuse
- Wiring Issues
How to Fix Error E21
DIY Fix Check for generic issues and power reset
- Turn the dryer off and unplug it from the power source for at least 10 minutes.
- Check that the lint filter is clean and properly seated.
- Ensure the dryer door is fully closed and the cycle is correctly set.
- Plug the dryer back in and try a basic cycle to see if the error clears.
Technician Only Diagnostic scan and control board inspection
- Connect diagnostic tools capable of reading Bosch service mode codes for the specific model.
- Check for communication faults and checksum errors in the control board memory.
- Inspect wiring harnesses and connectors for damage or poor connections.
- Replace or reflash the main control board if a checksum or communication fault is confirmed.
Parts needed: control board, wiring harnesses
- If the error code persists after basic resets and cleaning steps, or if the dryer does not operate normally, stop further inspection and contact Bosch authorized service.
- Avoid disassembling internal electrical components without appropriate training.
Technical Specifications
| wattage | 3000W |
|---|---|
| component | Heating Element |
| resistance | 10-30 ohms |
| part_number | Bosch 00420266 |
| voltage_rating | 240V AC |
Common Questions
What does E21 error mean on bosch dryer?
E21 error indicates a heating element malfunction, causing the dryer to not produce heat.
Can I fix bosch dryer E21 error myself?
Yes, try resetting the dryer and ensuring the lint filter is clean and properly seated.
How much does it cost to fix E21 error?
Estimated repair costs range from ¥20,000 to ¥50,000+, depending on the model and region.
When should I call a technician for E21?
Contact a technician if the error persists after basic troubleshooting or if the dryer operates abnormally.
Sources & References
- Bosch Dryer Error Codes (partial list) (official)
- Bosch Dryer Error Codes Singapore Support (official)
Data last verified: 2026-01-16
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