Direct answer
On the covered Bosch dishwasher platform, E21, E6002 means the heat pump is blocked. First, check the filter and sump for debris.
Definition versus diagnosis
The display names a detected condition—not an automatically failed part.
What this covers
- Bosch dishwasher models covered by the cited manufacturer code family
- Displayed code or documented alias: E21, E6002
- The operating stage and conditions described by the source
What it does not cover
- ×Another appliance type or original-manufacturer platform
- ×A code that merely resembles these characters
- ×Internal live electrical, gas, sealed-system or control-board repair
Verify the exact code and model
ReversiblePhotograph the complete display and model label. Code aliases in this record: E21, E6002. Bosch North American dishwashers. Older platforms display short codes (E01-E27); newer platforms display four- and five-digit codes (E0100, E2030, E6101, E9240) for the same conditions. Available customer actions vary by platform.
Perform the first non-destructive check
ReversibleCheck the filter and sump for debris. Do not clear the display before recording the operating stage and remaining water, heat or load state.
Correct only the documented fault domain
ReversibleClear the blockage as the manual directs; arrange service if the code returns. Do not substitute a similar brand or product code table for the exact model manual.
Verify or escalate
ReversibleRun only a safe short test that reaches the original stage. If E21, E6002 returns, stop repeated resets and use model-specific manufacturer service.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What does E21, E6002 mean on a Bosch dishwasher?+
The heat pump is blocked.
Can I reset E21, E6002 without fixing the cause?+
A reset may clear the display temporarily but does not correct the documented fault domain. Record the code and complete the safe checks first.
Why do I need the complete model number?+
Manufacturers reuse characters across different controls and product platforms. The full model identifies which official code table and service data applies.
When should I stop troubleshooting?+
Stop for smoke, arcing, burning odor, gas odor, uncontrolled water, electrical wetting or any condition the manufacturer directs to service.
Answer for the exact device and software version shown above.