What to check first
Can I keep using it?
Do not keep using the appliance while this warning is active.
Do not keep using the appliance if the code points to voltage, wiring, control power, burning smell, smoke, or a possible miswired supply.
- Safe next step
- Use only safe owner-level power checks, then involve a qualified technician or electrician when the source points to wiring or supply voltage.
- Stop when
- Breakers trip, lights dim, the appliance smells hot, wiring may be miswired, or the warning returns after a safe reset.
Do not keep running the appliance when water is visible, a leak warning is active, or water could reach wiring or controls.
- Safe next step
- Stop the cycle if safe, turn off water when appropriate, protect the floor, and avoid repeated resets until the leak source is understood.
- Stop when
- Water is near wiring, cabinetry is getting wet, the leak returns, or the source is not safely visible.
Safety boundaries
Safe first
- Match the exact brand, appliance type, and displayed code first.
- Use the model manual as the final authority for access steps.
- Stop and address visible water before retrying the appliance.
- Disconnect power before any service-access step.
Do not do this
- Do not keep running the appliance while this code is active.
- Do not bypass locks, float switches, leak sensors, or other safety systems.
Common causes include
- The household electrical supply is below the range expected by the dishwasher
- A branch-circuit, receptacle, connection, or utility-supply condition requires professional electrical assessment
Basic checks
- Observe whether lights in the home are unusually dim or other appliances behave abnormally after stopping the dishwasher; either sign means the household supply needs professional electrical assessment.
- Photograph E27 and record the complete E-Nr for context, then leave the dishwasher off until a licensed electrician has checked the home's voltage and electrical system as Thermador directs.
- If there is sparking, smoke, a burning electrical smell, a hot outlet, or repeated breaker trips, keep clear and isolate power only from a dry safe location if possible.
Reset or retry steps
- Do not reset, repeatedly power-cycle, or run the dishwasher while E27 is present; the official page classifies this as a household supply condition for a professional electrician.
- Resume use only after the electrical supply has been professionally checked and corrected and there is no heat, odor, water, outlet damage, or breaker problem.
When to call a technician
- Contact a licensed electrician for E27 because Thermador directs the home's voltage and electrical system to professional inspection.
- Contact Thermador support as a separate next step only if E27 remains after the electrician confirms a normal, safe supply for the exact dishwasher requirements.
Before approving a paid visit, check warranty status and reviewquestions to ask before repair.
FAQ
What does Thermador Dishwasher code E27 usually mean?
Thermador US documents E27 as supply voltage that is too low rather than an appliance fault. Model context matters: The Thermador US page explicitly says E27 is not an appliance fault and directs the owner to a professional electrician for the home's voltage and electrical system.
Can I keep using the dishwasher with code E27?
Do not keep using the appliance until the visible issue has been checked and the relevant safety warnings have been addressed. Never measure mains voltage, remove an electrical cover, probe wiring, replace a breaker, or work on an energized receptacle as an owner check.
When should I call a technician for Thermador E27?
Contact a licensed electrician for E27 because Thermador directs the home's voltage and electrical system to professional inspection. A qualified technician may check Household branch circuit and receptacle and Dishwasher power-input system against the model's service information before treating any part as failed.