Bosch US describes E27 as low household supply voltage. If it returns after the permitted reset, Bosch directs an electrician to check the incoming supply rather than recommending a dishwasher part.
Bosch US dishwasher code guidance for the displayed code. Match the full E-Nr and its own manual; the same short number in another appliance category, market or generation must not be assumed equivalent.
Stop and isolate power before permitted user maintenance, and let water cool. Watch for sharp debris. Do not reach blindly into a sump, open electrical panels or use drain-opening chemicals. Stay clear of water near electrical equipment.
Compare the behavior
If the supply-voltage warning returns, arrange the electrical assessment Bosch recommends. The code does not justify ordering a pump or control board, opening the junction box or probing energized wiring.
| Observed state | Interpretation / next step |
|---|---|
| E27 returns | Arrange incoming-supply assessment. |
| Supply checked and documented normal | Share results with Bosch for next diagnosis. |
| Unsafe electrical signs | Stop using the appliance. |
Code-specific checks
Preserve recurrence without repeated resets
Photograph the code and record when it occurs. Note recent electrical work, outages or other unusual household power behavior without intentionally switching loads to reproduce a fault. Include whether the dishwasher ever completes normally. These observations help the electrician understand an intermittent problem. Bosch permits a 30-second breaker reset for E27. Only operate a safely accessible, correctly identified breaker. If the warning recurs, repeated resets are not a remedy for the reported supply condition. Do not use an extension lead, adapter or alternative unverified circuit to keep the appliance running.
Choose the correct professional
The manufacturer’s recurring-E27 instruction is to have an electrician check incoming voltage. The owner does not need to prove low voltage with live probes first. If the electrician verifies the supply and the appliance still reports the warning, retain the findings for Bosch service rather than discarding them as unrelated.
Keep code evidence ahead of internet theories
Follow Bosch US’s code meaning for your appliance. A voltage-related warning is not a reason to open the junction box, tighten internal terminals or test energized wiring yourself. Stop if you notice burning, overheating or other unsafe electrical signs.
If the warning returns
One permitted reset → if E27 returns, electrician → documented supply findings to Bosch if needed.
When to stop and get help
Only carry out maintenance permitted in your model’s manual. For service, note the full model number and suffix, displayed code, selected cycle and what happened during the checks. Leave internal wiring, gas components, pumps and safety devices to a qualified professional. A symptom alone does not identify a failed part.
Sources & references
- E27 low household supply; electrician if recurrence E27 entry
Based on publicly available manuals, manufacturer support and the references listed here. We have not inspected or tested your appliance. Follow the instructions for your exact model; a guide cannot replace an in-person diagnosis.