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Bosch Dishwasher E21 Error Code

Heat pump blocked. What it means, which models show it, and how to clear it, easiest fix first.

BoschAll Bosch dishwasher codes

E21
May need a pro

The heat pump, which moves wash water around the dishwasher, isn't turning freely. Debris or a mechanical fault in the pump can cause this.

Compatible models

Bosch doesn't publish a model list for this code; it appears on Bosch dishwashers with a digital display. Check your owner's manual.

Also shown as

Newer US models show E6002. European guides list E21 as a fault that needs service.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Safety first: unplug the dishwasher (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Bosch E21

  1. Clean the filter

    Switch off the breaker or unplug the unit, then remove and rinse the filter. A badly clogged filter can let debris reach the pump.

  2. Reset the dishwasher at the breaker

    Switch off the dishwasher's circuit breaker, wait about 30 seconds, then switch it back on. Run a short cycle with the dishwasher empty and watch whether the same code comes back. A code that clears and stays away was likely a one-time glitch.

When to call a technician

If E21 returns after a reset, call Bosch support or a technician. The pump needs to be inspected and possibly replaced.

Parts linked to E21

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

What does E21 mean on a Bosch dishwasher?

The heat pump, which moves wash water around the dishwasher, isn't turning freely. Debris or a mechanical fault in the pump can cause this.

Which Bosch models show the E21 code?

Bosch doesn't publish a model list for this code; it appears on Bosch dishwashers with a digital display. Check your owner's manual.

Can I fix Bosch E21 myself?

Only the basic checks. You can safely try the steps above, but E21 usually points to a part or fault that needs a technician.

What if E21 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when E21 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Other Bosch dishwasher codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked