What does error code E21 mean on a Bosch dishwasher?

Circulation pump blocked. The circulation (heat) pump is blocked.

Can I fix Bosch code E21 myself?

Start with these safe checks: Turn the breaker off for 30 seconds and back on. If not resolved, contact Bosch support.

When should I call a technician for code E21?

If not resolved, contact Bosch support. Unplug it or switch the breaker off before you remove any panel. Don't test or replace wiring, control boards, heating elements or motors under power. If you see scorching, smell burning, or the breaker trips again, leave it off and call a qualified appliance technician or electrician.

Bosch Dishwasher Error Code E21 / E:21: Circulation pump blocked

What E21 means

The circulation (heat) pump is blocked.

Also shown as: E:21, depending on the model.

Likely causes

Debris in the pump
Pump fault

Safe first checks

Turn the breaker off for 30 seconds and back on.

When to stop

If not resolved, contact Bosch support.

Checked against: Bosch USA: Bosch dishwasher error codes troubleshooting guide. Codes can differ by model and year, so confirm with your owner's manual.