Electrolux EHS6690U Installation And Operating Instructions Manual page 15

3. Touch the "booster" sensor field.
The middle ring is switched on. The control indicator under the
symbol II is illuminated.
4. Touching the "booster" sensor field again activates the outer heating
ring. The control indicator under symbol III is illuminated.
5. To switch off the outer heating rings touch the "booster"
sensor field; the corresponding outer heating ring is switched off.
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