What to check, in order
- Switch off and on
That resets it.
- Watch the next wash
If the code comes back, stop using the machine.
When to call an engineer
If it comes back. A heater switching on when it shouldn't is a safety issue.
A repair visit will usually check the heating element, its temperature sensor and the wiring back to the control board.
- Note the model and serial number. They're on a label inside the door, around the door frame or on the back.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Quick answers
What does the Bosch E20 error code mean?
A safety check found the water heating up when the washer hadn't asked for heat.
Can I fix Bosch E20 myself?
Engineer only (1 minute to reset). Start with: switch off and on; watch the next wash. If it comes back. A heater switching on when it shouldn't is a safety issue.
Is Bosch E20 worth repairing?
Deal with it now. If it returns, stop using it and book a repair. Uncontrolled heating isn't something to live with.
Checked against
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.