Bosch Dishwasher E21: Official Meaning and Checks
Direct answer
What E21 means
Official Bosch material describes E21 as The heat pump is blocked. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Before you begin
Safety first
Safety review is complete for the owner-accessible checks shown here. Do not remove panels, bypass controls, or test live circuits.
- Record the complete displayed code and the full model number before clearing the display.
- Disconnect power before touching a user-accessible filter, hose, burner, or electrical connection.
- Stop using the equipment if it leaks, smells burned or of gas, smokes, sparks, or trips a breaker.
Does this guide apply?
- Region
- United States
- Product family
- Bosch dishwashers (the official page lists no specific models; codes tied to Crystal Dry/Zeolite or PowerControl features apply only to models with those features)
- Scope note
- The cited source scope is Bosch dishwashers (the official page lists no specific models; codes tied to Crystal Dry/Zeolite or PowerControl features apply only to models with those features). Confirm the complete model number before applying the guidance; an empty model list does not imply all models.
Common paths to check
These are source-backed possibilities, not probability estimates for your specific unit.
- 01 Official source meaning: The heat pump is blocked.
Decision path
Safe checks, in order
- 1
Confirm code and model scope
Compare the complete display and full model number with the cited manufacturer page or manual before applying any troubleshooting instruction.
Expected: The official source explicitly covers the displayed code and product family.
If not resolved: Contact manufacturer support with the full model and serial number.
- 2
Follow the official owner checks
Reset power at the breaker for 30 seconds. If not resolved, call Bosch Customer Support at 1-800-944-2904.
Expected: Only the user-accessible condition identified by the official source is corrected.
If not resolved: Stop repeated resets and arrange qualified service if the code returns or the source directs service.
Reset and test
- Disconnect power at the breaker for 30 seconds, restore power, and if the error remains call 1-800-944-2904.
Important: A reset may clear the display but cannot repair the underlying condition; follow only the exact model-specific manufacturer procedure.
Escalation point
Stop and arrange service when
- The code returns after the cited user-accessible checks or the official source directs professional service.
- The equipment leaks, smells burned or of gas, smokes, sparks, overheats, or trips a breaker.
Official sources
We paraphrase manufacturer material and show the publication scope so you can verify it.
- Bosch Dishwasher Error Codes: Troubleshooting Guide ( section: Error Code E21 Bosch · E21 · accessed 2026-08-08
Reviewed by Device Fix Guide · Last source check: