What E4 Means
An independent Thermador-focused repair guide documents E4 as the bake element open — the bottom element has burned through, so the oven won't heat in bake mode. Independently sourced rather than confirmed on Thermador's own generic error documentation.
Common Causes of E4
- A burned-through bake element from normal end-of-life wear
- A wiring problem at the element's connection terminals
🔧 One Safe Check You Can Try
A visibly burned-through or blistered bake element (visible as a break in the coil, if accessible) is a reasonable visual check, but replacement itself involves a line-voltage part.
⚠ Why You Shouldn't Go Further Than That
- Replacing a line-voltage heating element without de-energizing the circuit correctly is a real shock and fire risk.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.