Bosch Washing Machine Error E:30/-20: What It Means and How to Fix It
Short answer
E:30/-20 on a Bosch washing machine means: possible causes: detergent dosage too high, additional water added, or a defective solenoid valve. First step: Reduce detergent for the next load.
Excess detergent / extra water / valve
Likely causes
- Detergent dosage too high
- Additional water added
- Solenoid valve defective
How to fix it
- 1Reduce detergent for the next load.
- 2Do not add extra water to the appliance while it runs.
- 3If the code persists, contact Bosch customer service.
When to call a professional: If the solenoid valve is suspected, contact Bosch support.
Applies to: Bosch washing machines
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Source
Based on Bosch's official error code information: Bosch US – Washer Error Codes. Last checked 2026-10-28. Codes and their meaning can differ by model and region; check your appliance's manual.
Frequently asked questions
What does Bosch washing machine error code E:30/-20 mean?
Possible causes: detergent dosage too high, additional water added, or a defective solenoid valve.
How do I fix E:30/-20 on a Bosch washing machine?
Reduce detergent for the next load. Do not add extra water to the appliance while it runs. If the code persists, contact Bosch customer service.
When should I call a technician for E:30/-20?
If the solenoid valve is suspected, contact Bosch support.