E18
Bomann Function Selector / Mode Switch Fault

Oven shows E18 and beeps when starting, then stops immediately

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Safety Warning

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.

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Possible Causes

Worn mechanical function selector switch, Dirty or oxidized contacts in selector, Broken shaft or knob not fully engaging switch, Faulty electronic mode encoder

How to Fix / Troubleshooting

Safety: Disconnect the oven from mains.

Inspect selector:

  • Remove the control knobs and front panel to access the function selector switch or encoder.
  • Check for a cracked plastic shaft or knob that prevents full rotation.
  • On mechanical switches, inspect for burned or loose terminals. Lightly clean contacts if accessible using electrical contact cleaner.
  • Test continuity across the switch positions according to the wiring diagram. Replace the function selector switch if readings are inconsistent.
  • On electronic encoders, replacement of the UI board is usually required if faulty.
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Repair Difficulty

Medium 3/5

Required Part

Function Selector Switch
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