FROM THE TROUBLESHOOTING LIBRARY
Bosch Dishwasher E21 Error Code Fix Guide
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What E21 means
Bosch lists E21 as a blocked heat pump. The index does not make this a universal instruction to remove the pump; access and the meaning of a blockage vary with the E-Nr.
Primary reference: Bosch US dishwasher error-code index.
Safe checks
- Switch the dishwasher off and note E21 and the model/E-Nr.
- Check and clean only the removable filter if the exact manual describes that step. Do not reach into a pump opening or use a sharp tool.
- Reset power for 30 seconds if safe, then make one test.
- If E21 returns, stop and contact Bosch service. Do not dismantle the heat pump.
When to stop
Standing water, broken glass, a leak, a hot smell or a pump that hums without moving water needs professional handling. Keep fingers and tools out of the pump cavity.
Parts You Might Need
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