Oven displays E305 and will not heat, often occurring after installation or moving.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Incorrect wiring at the terminal block (single vs. three-phase), Loose neutral connection, Wrong bridge links on the terminal block.

Safety: Only a qualified electrician should work on mains connections. Always isolate power at the main breaker.

Check installation manual: Refer to the Siemens wiring diagram for your exact model and supply type (single-phase, two-phase, or three-phase).
Inspect terminal block: Remove the rear cover over the mains terminal. Verify that the phase bridges are installed exactly as shown in the manual and that all screws are tight.
Verify supply voltage: Measure voltage between phases and neutral to ensure correct supply. Incorrect voltage can trigger E305.
Correct wiring: Adjust wiring and bridges as required for the local supply configuration.

Professional Required 5/5

Mains Terminal Block / Wiring

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